Panasonic Lumix DC-S1 vs. Lumix DMC-GX850: The Definitive Comparison for Enthusiasts and Professionals

When Panasonic announced the Lumix DC-S1 in early 2019, it marked a significant leap in their full-frame mirrorless lineup, targeting prosumers and professional photographers with a robust, feature-rich package. On the other hand, the Lumix DMC-GX850 (also known as GX800 or GF9 in some markets), launched two years earlier, represents Panasonic’s entry-level Micro Four Thirds (MFT) mirrorless system, designed primarily for casual shooters and vloggers seeking portability and ease of use.

Despite both cameras sharing a common Venus engine image processor and brand heritage, their fundamental hardware, sensor technology, design philosophies, and targeted user bases set them worlds apart. This exhaustive comparison unpacks every critical aspect you must know - from sensor architecture and autofocus systems to real-world handling, photographic versatility across genres, and video prowess - equipping you with an authoritative, experience-driven perspective rooted in extensive hands-on testing.

The Physical and Ergonomic Divide: Handling vs. Portability

Starting with pure physicality, the Panasonic S1 embodies a professional-grade, SLR-style body with substantial size and heft designed for comfortable handling during long shoots, durability, and weather sealing. Conversely, the GX850 adopts a compact, minimalist rangefinder-style design prioritizing portability, making it ideal for casual and travel photography.

At 149 x 110 x 97 mm and weighing 1021g (body only), the S1 is noticeably larger and heavier than the GX850’s petite 107 x 65 x 33 mm and featherlight 269g. This size difference directly impacts not just physical comfort but also the lens compatibility ecosystem, grip design, and control placement.

The S1 features a deep handgrip, extensive weather sealing rated for dust and moisture, magnesium alloy body construction, and illuminated buttons, crafting an environment conducive to professional workflow demands. In contrast, the GX850 uses a lightweight plastic chassis without weather sealing - suitable for enthusiasts mindful of weight but less tolerant of rugged use.

The top view layout further reflects these philosophies; the S1 offers an abundance of dedicated dials and customizable buttons, a top status LCD screen, and twin card slots - highlighted in the image below - allowing rapid adjustments without menu diving, critical for professional reliability.

Meanwhile, the GX850's simplified control scheme is streamlined but sacrifices some tactile control finesse and expands usability at the cost of fewer physical buttons and single card slot storage.

Sensor Technologies: The Heart of Image Quality

Arguably the most consequential difference lies in the sensor technologies each camera employs, foundational to image quality, dynamic range, and low light capability.

Panasonic S1: Full-Frame CMOS Powerhouse

The S1 harnesses a 35.6 x 23.8 mm full-frame CMOS sensor, offering a substantial 847.28 mm² sensor area with 24-megapixel resolution (6000 x 4000 pixels) sans anti-aliasing filter. This sensor size inherently enhances light-gathering ability, translating to superior dynamic range, higher signal-to-noise ratio, and attractive bokeh characteristics.

Technical testing benchmarks with DxO mark the S1’s overall score at 95, a commanding level in mirrorless offerings. Notably, it achieves 25.2 bits color depth and an impressive dynamic range of 14.5 EV, both critical for retaining highlight and shadow information in landscapes and studio work. Plus, its native ISO range of 100–51200, expandable to ISO 50 or 204800 boost, underscores remarkable versatility for night and low-light photography.

Panasonic GX850: Compact Four-Thirds Sensor

The GX850's 17.3 x 13 mm Four Thirds CMOS sensor accounts for only 224.9 mm² area, roughly a quarter of the lumix S1’s sensor. Resolution is lower at 16 megapixels (4592 x 3448 pixels), still sufficient for casual prints and social sharing but limiting cropping potential for professional applications.

DxO gives the GX850 a more modest overall score of 73, driven by a respectable but narrower color depth of 23.2 bits and dynamic range of 13.3 EV. While adequate for daily shooting scenarios, its low-light ISO capability peaks at 25600 native, lacking the extended boost range of the S1. Real-world low light noise performance is therefore noticeably less refined.

Sensor size comparison comprehension is deepened by the visualization below:

Practical Implications

From this sensor disparity, we can infer the S1 delivers more nuanced tonal gradations, better shadow recovery, and inherently shallower depth of field for creative control over background separation - a key boon for portrait and landscape professionals. The GX850 suits social shooters and vloggers prioritizing size and convenience over ultimate image fidelity.

Viewing and Interface: Composing and Reviewing Images

Viewing capability and interface navigation are critical to photographers’ efficiency and satisfaction.

Panasonic S1: Electronic Viewfinder and Articulating Touchscreen

Equipped with a 5.76-million dot OLED electronic viewfinder (EVF), the S1 boasts 100% coverage and a 0.78x magnification, providing a clear, high-resolution preview of framing and exposure, invaluable in bright conditions where LCDs struggle.

The 3.2-inch 2.1-million dot tilting touchscreen complements the EVF with touch AF and intuitive menu controls. The addition of a top status screen enhances professional usability, allowing glanceable info without breaking the shooting flow.

Panasonic GX850: Screen-Only with Selfie Flip

Absent an EVF, the GX850 depends solely on its 3.0-inch 1.04-million dot tilting touchscreen, which, importantly, pivots 180 degrees upwards - making it exceptionally selfie- and vlogging-friendly. The touchscreen supports touch AF and menu navigation but naturally struggles in direct sunlight compared to an EVF.

The lack of an EVF can hamper precise focusing and framing accuracy in bright outdoors or fast-moving scenarios, revealing its budget-range compromise.

Autofocus Systems: Speed, Flexibility, and Tracking

Autofocus (AF) performance is pivotal across multiple genres, particularly wildlife, sports, and portraiture. Panasonic’s cameras rely heavily on contrast-detection AF, with some models integrating depth-from-defocus or phase detection elements. However, both the S1 and GX850 lack dedicated phase detection AF pixels, which factors into their performance.

S1’s Advanced Contrast-Detect AF

The S1 features 225 AF points, including various modes - face detect, eye detect (including humans only, no animal eye detection), continuous AF with good tracking, AF area selection, and post-focus stacking. Its Eye AF and focus stacking can be highly beneficial for portraits and macro work. It boasts a respectable 9 fps continuous shooting rate with AF tracking - a balance between speed and processing load for this sensor size.

Though lacking phase detection, the S1’s AF benefits from efficient algorithms and sensor-based 5-axis image stabilization, ensuring sharp focus confirmation and image clarity, particularly valuable with long telephoto lenses.

GX850’s Entry-Level AF System

With only 49 focus points and contrast-detection only AF, the GX850 delivers 10 fps burst shooting but with less reliable continuous AF tracking and slower subject reacquisition. It shines in simpler scenarios - self-portraits and static compositions - but struggles with fast-moving subjects or complex lighting.

Both cameras support focus bracketing, focus stacking, and post-focus features, empowering creative focus techniques.

Image Stabilization and Flash: Keeping Shots Sharp

Stabilization systems are crucial in handheld shooting, especially at slow shutter speeds or high zoom levels.

• Panasonic S1 integrates sensor-based 5-axis image stabilization, compensating for pitch, yaw, roll, and horizontal/vertical shifts. This system can be combined with lens optical IS (Dual I.S. 2), optimizing stabilization efficacy crucial for handheld landscapes, macro, and video capture.

• GX850 lacks in-body stabilization, relying solely on lens IS where available. This omission reduces versatility for low-light handheld shooting and video stabilization, constraining the user to slower shutter speeds or tripods in challenging environments.

Regarding flash:

• The S1 does not include built-in flash, expecting professional users to use external strobes, supported via hot shoe and high sync speeds (up to 1/320s).

• The GX850 comes with a modest built-in flash (4m range at ISO 100), useful for casual fill light but insufficient for professional lighting needs.

Video Capabilities: 4K Video and Beyond

Given Panasonic’s heritage in video technology (GH series), both cameras offer compelling video features but target distinct creators.

Panasonic S1 Video: Pro-Oriented 4K

The S1 records 4K UHD (3840x2160) up to 60p at 150 Mbps using H.264/HEVC codecs, capturing long, high-quality footage with excellent dynamic range and rich color processing, making it a strong hybrid still/video tool.

It features both microphone and headphone jacks, allowing real-time audio monitoring and professional sound capture setups.

The combination of 5-axis IBIS, ample exposure tools like zebra patterns and focus peaking, plus support for time lapse and 4K photo modes, complements a videographer’s workflow.

Panasonic GX850 Video: Entry-Level 4K

The GX850 offers 4K UHD video up to 30p @ 100 Mbps, sufficient for casual and social media video capture but lacking higher frame rates and more professional codec options.

It excludes external microphone and headphone connectivity, limiting controlled audio input and monitoring.

Video stabilization depends on electronic IS or lens IS only, less effective than the S1’s IBIS system.

Battery Life, Storage, and Connectivity

Long shooting sessions demand reliable battery life and storage flexibility.

• Panasonic S1 uses a battery with CIPA-rated life of approximately 380 shots, somewhat below some DSLR expectations but typical for mirrorless with EVF usage; this can be extended with optional battery grips. Dual SD card slots (both UHS-II compatible) offer professional-level backup/capture configurations.

• GX850’s diminutive frame limits battery capacity, rated at around 210 shots per charge. Single Micro SD card slot only restricts storage flexibility but suits casual use.

On connectivity, both cameras support built-in Wi-Fi, with the S1 also including Bluetooth for seamless pairing. The GX850 lacks Bluetooth.

Both provide HDMI output, albeit S1 supports full-size Type A connector, favorable for tethered workflows, while the GX850 uses a smaller Micro HDMI output.

Comprehensive Performance Ratings

Measured across overall performance metrics, sensor capabilities, and real-world testing, the cameras’ ratings reflect their intended users and design compromises.

Breaking down by photographic disciplines offers deeper insight:

Real-World Performance Across Photography Disciplines

Examining performance through the lens of common photography genres reveals additional nuances.

Portrait Photography

• S1: Excels with its full-frame sensor delivering refined skin tones, shallow depth of field for compelling subject isolation, and reliable Eye AF for sharp eyes. The wide ISO range and low noise also support indoor or event portraits.

• GX850: Limited shallower depth due to smaller sensor, less pronounced bokeh; however, face detect AF and flip screen favor casual selfies. Auto exposure is predictable; skin tones reasonably rendered given sensor size.

Landscape Photography

• S1: Outstanding dynamic range and high resolution permit capturing detailed landscapes with broad tonal gradation. Durable weather sealing enables shooting in harsh conditions. Sensor-based stabilization supports handheld wide-angle work in low light.

• GX850: Modest dynamic range and resolution limit image flexibility. No weather sealing reduces suitability in challenging environments. Small size aids travel-friendly landscape capture.

Wildlife Photography

• S1: AF tracking with 225 points is competent though slower than phase-detection rivals; however, large sensor area enables cropping telephoto shots effectively. IBIS aids longer telephoto handheld stability, though weight of lenses can be a factor.

• GX850: AF system and frame rate favor casual wildlife photography but lack tracking precision. Sensor size and crop factor limit reach and image quality for serious wildlife work.

Sports Photography

• S1: 9 fps continuous shooting and AF tracking is adequate for medium action but not elite speed cameras; professional sports photographers may desire faster options.

• GX850: 10 fps burst is fast but lacks reliable AF tracking, making it less consistent for action.

Street Photography

• S1: Larger size and weight make it less discreet, but excellent image quality and low-light performance perfect for night scenes.

• GX850: Compact, quiet shutter, and flip screen support candid street work and self-portraiture in urban settings.

Macro Photography

• Both cameras support focus bracketing and stacking, facilitating precision focus but the S1’s IBIS is a decisive advantage for sharp handheld macro shots.

Night and Astro Photography

• S1 outperforms with high native ISO and expansive dynamic range, enabling cleaner high-ISO captures and long exposures.

• GX850 can shoot night scenes but with higher noise and limited sensor capabilities.

Video

• S1: Professional features, better codec support, microphone and headphone ports, and superior stabilization.

• GX850: Accessible 4K at 30p, no external audio ports, best for casual users and vloggers.

Travel Photography

• GX850's small footprint makes it the ideal travel companion where weight matters most.

• The S1, though heavier, delivers superior image quality and weather proofing for serious travel work.

Professional Workflow

• The S1 supports dual cards, full manual controls, tethering, and extensive customization, fitting seamlessly into professional workflows.

• GX850 lacks these capabilities and suits entry-level and hobbyist workflows.

Lens Ecosystem and Compatibility

The Panasonic S1 uses the Leica L-mount, backed by Panasonic, Leica, and Sigma lenses. While the system is growing, it remains smaller than Sony’s E-mount or Canon’s RF as of mid-2024 but offers high-quality native lenses optimized for full-frame.

The GX850 utilizes the vast Micro Four Thirds lens ecosystem, with over 100 native lenses from Panasonic, Olympus, and third parties. This extensive range supports diverse focal lengths and budget options, although optical performance and maximum apertures generally lag behind full-frame options.

Choosing a camera often hinges on lens availability and cost alongside body features - a critical consideration for each user.

Price-to-Performance and Value Judgments

At launch, the Panasonic S1 body was priced around $2,497 (USD), placing it in the serious prosumer segment. In contrast, the GX850’s retail cost stood near $548, targeting budget-conscious photographers and casual users.

While the S1 demands significant investment, it delivers professional-grade image quality, robust build, and extensive feature sets worth every dollar for serious creatives. The GX850’s price point and portability make it an excellent starter camera or supplementary model.

Sample Comparisons: Visual Evidence of Sensor Differences

Side-by-side sample images demonstrate the pronounced advantages of the S1’s sensor in resolution, dynamic range, and detail retention, observed in landscapes and portraits alike.

Panasonic S1 front Panasonic S1 screen back Panasonic GX850 front Panasonic GX850 screen back

Summary Recommendations: Choosing the Right Panasonic Mirrorless

• Opt for the Panasonic Lumix DC-S1 if you:

  • Require professional-grade stills and video quality
  • Shoot in challenging environments needing weather sealing
  • Need robust battery life and dual storage
  • Want advanced autofocus with face and eye detection for serious portraits
  • Demand 4K 60p video with professional audio controls
  • Are invested or planning investment in Leica L-mount lenses

• Consider the Panasonic Lumix GX850 if you:

  • Seek a lightweight, pocketable mirrorless camera for travel or street
  • Are a casual photographer or vlogger valuing flip screen features
  • Have a strict budget and do not require extensive weather sealing or professional connectivity
  • Are interested in the vast Micro Four Thirds lens ecosystem
  • Prioritize portability over ultimate image fidelity

Conclusion

The Panasonic Lumix DC-S1 and GX850 represent fundamentally different philosophies within Panasonic’s mirrorless lineup, targeting distinct user profiles and needs. The S1 stands as a commanding full-frame professional tool, combining robust build, exceptional sensor capabilities, and versatile video functionality ideal for serious photographers and hybrid shooters. The GX850, conversely, serves entry-level and casual users craving compact design, selfie-friendly features, and a broad lens selection for everyday photography and social media content creation.

Evaluation guided by careful sensor analysis, autofocusing precision, ergonomics, and usability affirms these conclusions, supported by industry-standard benchmarks and real-world testing. For photographers and videographers researching their next camera investment, understanding these strengths, limitations, and use-case suitability ensures an empowered, satisfying purchase aligned perfectly with creative aspirations and workflow demands.

Author’s Note: This detailed comparison draws upon years of Panasonic product testing, metric analysis, and user experience, aiming to deliver an honest, comprehensive guide that supports both seasoned professionals and enthusiasts navigating an increasingly complex camera landscape. For nuanced usage scenarios or lens recommendations matched to brand ecosystems, further consultation with specialized expert resources or hands-on trials is encouraged.

Thank you for trusting this in-depth review. Happy shooting!

Images used by permission and sourced per specifications.