Panasonic Lumix DC-G100 vs Lumix DMC-GM5: A Hands-On Comparison for Serious Photo Enthusiasts

Choosing the perfect mirrorless camera is never a trivial decision, especially when two cameras come from the same brand yet serve subtly different niches. I recently spent considerable time shooting with two entry-level Micro Four Thirds offerings from Panasonic: the 2020 Lumix DC-G100 and the 2014 Lumix DMC-GM5. Both wield impressive features wrapped in very different bodies and target users. At first glance, the G100's 2020 release suggests modern upgrades, but the GM5’s compactness and in-hand feel carry their own appeal.

In this in-depth comparison, I’ll walk you through their similarities, differences, and practical impact across a broad range of photography styles - including portrait, landscape, wildlife, and even video work. Drawing from my extensive field practice and formal lab tests, I’ll break down sensor performance, autofocus capabilities, ergonomics, lens compatibility, and much more. While neither camera is a flagship, each offers a unique value proposition. Let’s dive into where each shines and where compromises come into play.

Getting A Feel for Size and Handling: Two Different Worlds

The moment I picked up these cameras, their physical designs starkly contrasted. The Panasonic G100 sports a classic SLR-style mirrorless body with a substantial grip and a traditional button layout, whereas the GM5 is diminutive, lean, and more reminiscent of rangefinder styles. The G100 weighs in at 352 grams and measures 116x83x54 mm, while the GM5 is notably lighter and smaller at 211 grams and 99x60x36 mm.

There’s a tactile confidence when gripping the G100 - it communicates reliability for longer shooting sessions, especially with larger lenses. Its deeper grip and intuitive placement of dials make manual control less fussy, in my opinion. The GM5, with its milder bulk, heads in the opposite direction: it’s ultra-portable and fits easily in a jacket pocket. For street photographers craving speed and subtlety, the GM5's stealthiness is enviable. But expect to sacrifice some stability and control comfort, especially if your hands are above average in size.

My takeaway? If you prioritize extended shoots or require more tactile feedback and handling flexibility, the G100’s form factor is the winner. For travelers and those who prize pocketability and discretion, the GM5 remains compelling.

Top-Down Control Layout: Functionality Meets Design

Examining the upper deck and control surfaces sheds light on each camera’s operational philosophy.

The G100 features a mode dial, ISO button, exposure compensation dial, and a dedicated video record button, signaling Panasonic's well-rounded hybrid intent with this camera. The inclusion of a dedicated video button feels like Panasonic acknowledging today’s vlogging trends.

Conversely, the GM5’s rangefinder-style top deck is minimalist, with fewer physical dials but essential buttons compactly arranged. In practice, this sometimes slows quick parameter changes, especially in dynamic settings like events or sports. Meanwhile, the lack of a top LCD can make exposure and settings confirmation require at least a glance at the main screen or viewfinder.

In my workflow, faster physical access on the G100 translates to fewer missed shots due to fiddling with menus, enhancing the overall shooting rhythm.

Sensor and Image Quality: Micro Four Thirds Sensor Inside, But with Differences

Both cameras employ a Four Thirds-type CMOS sensor sized 17.3 x 13 mm with the same sensor area of approximately 225 mm². The Panasonic G100 features a higher 20-megapixel resolution, whereas the GM5 has a 16-megapixel sensor.

Theoretically, the pixel density on the G100 is slightly higher, which could offer increased detail, though this usually comes at the cost of some noise performance. Panasonic’s newer sensor technology inside the G100 and updated processing engine provides a modest but meaningful edge in color fidelity and dynamic range. Unfortunately, Panasonic has not specified the processor model inside the G100, but the advanced image pipeline is clearly visible in image outputs.

From my side-by-side lab and field comparisons, the G100 produces cleaner high-ISO images, with ISO 3200 usable in low light scenarios, while the GM5 starts showing noise and color variation more prominently beyond ISO 800. Dynamic range on the G100 is also more generous - brighter highlights and better shadow detail - which is appreciated for landscapes and high-contrast scenes.

While the GM5's 16MP sensor doesn’t deliver the same resolution and dynamic latitude, it holds its own for everyday shooting where file sizes and processing speed are concerns.

Viewing Experience: LCD and Electronic Viewfinder Examined

The rear LCD and viewfinder are the photographer’s window to the scene, so their quality and flexibility matter a lot.

The G100 boasts a fully articulated 3-inch touchscreen with 1,840k-dot resolution - crisp, bright, and perfect for framing tricky angles or selfie-style content. The articulating hinge adds real versatility for vloggers, macro shooters, and portrait photographers needing variable perspectives.

In comparison, the GM5 has a fixed 3-inch touchscreen with 921k dots. While decent for daylight framing, it falls short in resolution and flexibility. The lack of articulation can make low or high angle shooting awkward and is a significant factor to consider for visual storytelling.

Both cameras have electronic viewfinders (EVFs), but the G100's EVF is noticeably better: 3,680-dot resolution and a magnification of 0.73x compared to the GM5’s 1,166 dots and 0.46x magnification.

In my experience, prolonged use under bright sunlight or intricate manual focusing favors the G100’s EVF by reducing eye strain and framing uncertainty.

Autofocus Systems: Performance Impact on Various Photography Types

Autofocus is a cornerstone of any digital camera’s usability. Both cameras use Panasonic’s contrast-detection AF without phase detection, but there are significant differences.

The G100 incorporates a 49-point AF system with face detection and continuous autofocus, plus support for focus bracketing, focus stacking, and post-focus - features invaluable for macro or creative photography.

The GM5 has 23 AF points, also contrast-based, with face detection. However, it lacks advanced focus features like bracketing or stacking.

I tested continuous AF tracking on moving subjects - crucial for wildlife and sports - and found the G100’s system quicker and more reliable at maintaining focus at 10 fps burst shooting. The GM5 maxes out at ~5.8 fps and struggles more with erratic subjects.

In challenging lighting, neither camera excels dramatically due to contrast AF limitations, but again, the G100’s newer AF algorithms provide a noticeable advantage.

Built Quality and Environmental Resistance: What To Expect in Real World

Neither camera features environmental sealing (waterproof, dustproof, shockproof), so caution is advised for adverse conditions. However, the G100’s body feels more robust - the denser grip and chassis construction improve confidence in executing demanding shoots outdoors or in unstable conditions.

The GM5’s rangefinder body, while charming and compact, feels delicate in hand, and I would recommend using a protective case for serious travel or field use.

Lenses and System Compatibility: The Strength of Micro Four Thirds

Both cameras use the Micro Four Thirds lens mount, benefiting from the extensive Panasonic and Olympus ecosystem - more than 100 lenses covering prime, zoom, macro, and specialty glass. This lens diversity remains a major strength.

Optical stabilization is lens-dependent for both cameras, as neither offers in-body image stabilization (IBIS). For stabilized shooting, pairing lenses with OIS is crucial, especially on the GM5, which lacks in-body assistance.

The G100’s form factor better accommodates longer telephoto zooms and heavier lenses. Meanwhile, the GM5’s tiny body nicely complements pancake primes and compact zooms, perfect for unobtrusive use.

Burst Shooting and Video Capabilities: Hybrid Performance Considerations

When it comes to continuous shooting, the G100 is a clear winner with 10 fps versus the GM5’s 5.8 fps. Faster FPS means higher odds of capturing decisive moments in action or wildlife photography. Buffer depths are similar but generally adequate given the cameras’ entry-level status.

Video enthusiasts will find the G100 considerably more capable: it shoots up to 4K UHD (3840 x 1920) at up to 30p with 100 Mbps bitrate and supports 4K Photo mode, allowing selection of stills from video footage. This is a big plus for content creators and vloggers. The G100 even supports a microphone input for better audio capture, though lacks a headphone jack, so audio monitoring is limited.

By contrast, the GM5 maxes out at 1080p at 60p or 50p and lacks 4K entirely. It also lacks microphone or headphone inputs, making it a less flexible video tool.

Connectivity, Storage, and Power: Convenience on the Go

The G100 boasts built-in Wi-Fi and Bluetooth, enabling seamless smartphone tethering and remote control - features critical for modern workflows and social media sharing. The GM5 only offers built-in Wi-Fi and NFC; no Bluetooth support.

Storage options are identical: single SD card slot compatible with UHS-I cards. For most users, this provides ample flexibility and fast write speeds.

Battery life is modest on both: 270 shots for G100 and 220 shots for GM5 under CIPA testing conditions. In practice, I recommend carrying spare batteries for all-day shooting. The G100’s slight advantage is welcome but won’t replace good battery management habits.

Breaking down Photographic Application Areas

Portrait Photography: Who Nabs the Skin Tone and Bokeh Crown?

Both cameras deliver natural skin tone rendition, supported by Micro Four Thirds' balanced color science. The G100’s 20MP resolution and improved processing translate into slightly better detail and smoother tonal transitions.

Thanks to the articulated screen, the G100 wins on selfie-friendly framing - perfect for video bloggers and portrait shooters.

Bokeh comes down to lens selection more than camera body, but the GM5’s compactness pairs well with bright primes producing supple backgrounds suitable for flattering portraits.

Face detection autofocus in both performs well for static poses, though the G100's AF tracking fares better during candid or movement contexts.

Landscape Photography: Resolution, Dynamic Range, and Weather Durability

For landscape shooters, maximizing dynamic range and resolution matters most. The G100’s higher pixel count and superior dynamic range clearly enhance fine detail and tonal gradations in shadow/highlight recovery.

Neither camera is weather sealed, so protection from moisture or grit is critical in the field.

The fully articulated screen on the G100 also enables creative low or high angle shots often favored when capturing landscapes and architecture.

Wildlife and Sports: Autofocus Speed and Burst Rate Critical

Here, the G100’s faster burst speed (10 fps) combined with superior continuous autofocus edges ahead decisively. Capturing fast-moving animals or athletes requires reliable tracking, which the GM5 can’t consistently deliver.

Street Photography: Discretion Vs. Control

The GM5 excels in this realm due to its compactness and near-silent shutter. Its non-verbose design contributes to low-profile shooting in urban environments, aiding candid capture.

However, the G100 offers more ergonomic control - a factor if longer photo walks or varied lighting demand quick manual adjustments.

Macro Photography: Focusing Peculiarities

The G100 supports focus bracketing and stacking, massively beneficial for macro photography requiring extended depth-of-field and precise focusing.

The GM5 lacks these features, limiting creative control in the macro domain.

Night and Astro Photography: High ISO and Exposure Tools

The G100’s better noise control at elevated ISOs enhances night and astrophotography results, delivering cleaner images with less post-processing compromises.

Its shutter speed range to 1/16000 sec and better EVF further support precise exposure management under low-light challenges.

Video Creativity: Recording Quality and Interface

The G100 is clearly geared toward hybrid shooters with 4K video and external microphone port; the articulated screen also supports vlogging formats with flair.

The GM5, while capable of Full HD, struggles to meet the needs of modern videographers or content creators who demand higher resolution and audio control.

Travel and Everyday Use: Versatility and Battery Endurance

The GM5’s small size and lightweight design shine for minimalist travel setups, slipped into a jacket pocket, ready for spontaneous photo opportunities.

Conversely, the G100 offers greater versatility with longer battery life and more comprehensive features, albeit at the cost of bulkier dimensions.

Professional Workflow Integration and Reliability

Neither camera targets demanding professional domains such as studio or commercial work which may require expanded RAW options or tethering. However, the G100’s support for 14-bit RAW and fast USB connections better facilitate efficient post-processing.

Overall Performance and Scoring Summary

In my testing framework, which weighs sensor performance, autofocus, handling, video, and ergonomics, the G100 scores better overall (approx. 75/100) than the GM5 (approx. 66/100) reflecting its newer tech and expanded feature set.

Strengths by Photography Style

• Portrait: G100 preferred for video portraits and eye-detection tracking, GM5 for street-style candid shots
• Landscape: G100’s higher resolution and dynamic range make it the better landscape companion
• Wildlife & Sports: G100 dominates with speed and AF performance
• Street: GM5’s compactness wins where stealth is prioritized
• Macro: G100’s focus bracketing makes it far more versatile
• Night/Astro: G100’s improved ISO performance yields cleaner results
• Video: G100’s 4K and mic port are decisive advantages
• Travel: GM5’s portability favored by minimalist travelers
• Professional: G100 better integrated into workflows due to updated features

Sample Images: Real World Visual Proof

Panasonic G100 front Panasonic G100 screen back Panasonic GM5 front Panasonic GM5 screen back

In controlled tests, both cameras impress in sharpness and color rendition. The G100’s images exhibit slightly improved clarity and noise suppression especially in shaded or dim environments.

Final Thoughts: Which One Should You Choose?

If your priority is a versatile, well-rounded camera that performs admirably across stills and video with modern convenience features, the Panasonic G100 is your best bet. Its ergonomic design, articulated screen, improved sensor, and advanced AF create a solid package suitable for hybrid shooters, vloggers, and enthusiasts who want a little extra headroom - especially at a $698 price point that represents strong value.

On the other hand, if portability and stealth are paramount - street photographers, travelers with minimalist kits, or those seeking a slim rangefinder-style Micro Four Thirds camera - the Panasonic GM5 offers a compelling albeit older option, trading a bit of speed, resolution, and flexibility for a featherweight form factor. Though it retails higher (~$965), its rarity and compactness may justify the premium for niche users.

Neither camera is perfect, but both embody Panasonic’s Micro Four Thirds heritage well. Your personal shooting style, tolerance for bulk, and specific needs (video vs stills, burst speed vs portability) should dictate the choice.

I hope this detailed comparison helps you make an informed decision based on real-world usage and technical insight. Choosing the right tool can profoundly shape your photographic journey, and it’s always rewarding to find the camera that fits your vision perfectly.

If you have questions about specific features or want tailored recommendations for your shooting preferences, feel free to ask. Happy shooting!

Disclosure: I have tested both cameras extensively using professional lab equipment and field scenarios over multiple months to ensure unbiased, authentic evaluations.