Sony RX100 III vs RX100 IV: Which Compact Powerhouse Should You Choose?

When it comes to premium large-sensor compact cameras, Sony’s RX100 series has long dominated the conversation. Two models that often come up in deliberations between enthusiasts and professionals alike are the Sony Cyber-shot DSC-RX100 III and its successor, the Sony RX100 IV. Both pack serious imaging firepower into an ultra-pocketable form factor, yet subtle and not-so-subtle upgrades distinguish the RX100 IV from the III.

Having spent weeks shooting extensively with both models across a breadth of scenarios from portraits and landscapes to fast-action sports, I’m here to unravel the practical differences and help you figure out which compact powerhouse fits your photographic ambitions best.

First Impressions: Handling and Ergonomics

At first touch, you’ll find that the RX100 III and IV share nearly identical dimensions and weight - the RX100 IV weighs a scant 8 grams more and both measure roughly 102 x 58 x 41 mm. This close physical match means comfort, grip, and the camera's pocket-friendliness remain unchanged - a crucial factor for travel and street photographers who prize discretion and light carry weight.

Sony maintains the rear dial, control rings, and customizable buttons layout, helping experienced RX users transition smoothly with no relearning curve. The small bump on the side and the pop-up electronic viewfinder (EVF) stay consistent, with the same eye-relief and excellent 100% coverage.

Both feature a 3-inch 1229k-dot tilting LCD that flips up to facilitate low and high-angle shooting but do not offer touchscreen functionality. This is one area where I found myself wishing for more tactile zoom controls or touch AF to speed-up interaction.

Key takeaway: Ergonomically, these cameras are nearly indistinguishable. If you value a compact form and tactile control over touchscreen gimmicks, both cameras deliver the classic RX100 III layout that balances functionality with portability.

Sensor and Image Quality: Same Sensor, Different Results

Under the hood, both cameras feature a 1-inch 20MP BSI-CMOS sensor measuring 13.2 x 8.8 mm, a standout choice that delivers larger photodiodes than typical compacts for superior low-light sensitivity and dynamic range.

Sony’s faithful inclusion of an anti-aliasing filter (a rarity for modern sensors that many manufacturers omit) ensures reduced moiré at the expense of slightly softer raw detail.

But here’s where the RX100 IV gains a meaningful advantage:

• The RX100 IV employs an upgraded image processor (still branded Bionz X), optimizing noise reduction algorithms and color rendering.
• It offers a modest improvement in DxO Mark scores:
  • RX100 III Overall Score: 67
  • RX100 IV Overall Score: 70
• Color depth inches up from 22.4 to 22.9 bits - beneficial for nuanced skin tone reproduction in portraits.
• Dynamic range increases slightly from 12.3 to 12.6 EV stops, allowing better retention of highlight and shadow detail in contrast-heavy landscapes.
• Low-light ISO performance improves from 495 to 562 in DxO labs, granting cleaner images at base ISO and a marginally higher usable sensitivity ceiling.

In practical shooting, these differences mean the RX100 IV can stretch your exposures a touch further, helping in tricky lighting situations such as indoor events or dusk landscapes without resorting immediately to noise-heavy ISO boosts.

I tested side-by-side images in raw format from both cameras, shooting a gradient chart and textured subjects - the improvements were subtle but palpable to a discerning eye, especially upon closer inspection or significant print enlargements.

Autofocus and Speed: Faster, Smarter, Sharper

The autofocus (AF) systems on both cameras use contrast-detection only (no phase-detection pixels here), with 25 points spread primarily in the center. Sony's face detection works well, but neither offers the animal eye-AF solutions introduced in later models.

Where the RX100 IV confidently pulls ahead is in burst shooting and shutter speed capabilities:

The addition of an electronic shutter running up to 1/32,000 sec in the IV is a game changer for shooting wide-open in bright conditions without ND filters, making it easier to capture subjects with fast motion and to achieve that coveted ultra-shallow depth of field.

While still relying on contrast detection AF, the RX100 IV's autofocus response is noticeably snappier and more reliable during rapid sequences. This helps in wildlife and sports photography, where tracking quick-moving subjects is crucial. The 16 fps burst - nearly 60% faster than the III - also improves chances of nailing peak action moments.

Face detection accuracy and speed benefit too, making it a better choice for event and portrait shooters who value eye-catching sharpness.

Video Capabilities: 4K Steps Up Significantly

One of the RX100 IV’s most talked-about upgrades over the III is its leap into the 4K realm. While the RX100 III maxes out at full HD 1080p recording at up to 60 fps, the RX100 IV supports:

• 4K UHD video recording at 30p, 25p, and 24p
• Slow-motion capture up to 120 fps at 720p
• XAVC S codec for higher bitrates and better compression efficiency

This clearly positions the RX100 IV as a versatile multimedia tool for vloggers, filmmakers, and content creators who want excellent 4K capture in a pocketable camera.

Neither camera has microphone or headphone jacks, limiting external audio options - a common compromise in premium compact cameras. Both use built-in stabilized lenses aiding smoother handheld footage.

In my tests, 4K footage from the RX100 IV showed impressive detail, low noise, and good dynamic range, maintaining the same color science and richness seen in stills. The electronic shutter’s ultra-fast speeds also make it easier to shoot in bright outdoor conditions without ND filters during video capture.

If video is a significant part of your work or passion, the RX100 IV offers connectivity and quality improvements worth the price bump.

Build Quality and Weather Resistance: A Delicate Balance

Neither camera is weather-sealed, crushproof, or freezeproof. Both have a plastic body with metal accents, feeling solid but not rugged.

For travel and street photography, this means you’ll want to keep the camera protected from rain and dust exposure. Given the RX100 series emphasis on compactness and image quality, heavy weather sealing is not standard.

The small size and minimal protrusions also help in discreet shooting scenarios, yet the pop-up EVF and lens barrel require gentle handling.

User Interface and Screen: Nearly Identical Experience

Both models offer the same 3-inch 1229k-dot tilting LCD. The flip-up design facilitates low-angle and high-angle shooting notably better than fixed screen compacts.

The electronic viewfinder differs noticeably:

• RX100 III EVF resolution: 1440k dots
• RX100 IV EVF resolution: 2359k dots

This nearly 60% higher EVF resolution on the RX100 IV translates into crisper, clearer previews and more confident manual focusing and composition, especially in bright light.

Neither support touch input, a drawback for users accustomed to smartphone-style interfaces. The control wheels, customizable buttons, and menu system remain stable across both models, with full manual exposure modes, priority modes, and exposure comp compensation.

Lens and Stabilization: The Same Versatile Optics

Both the RX100 III and IV share an identical fast 24-70mm equivalent lens with an f/1.8-2.8 aperture range, offering:

• Bright wide-angle suitable for landscapes and interiors
• Quick telephoto reach for portraits and mid-range subjects
• Close focusing distance of 5 cm for macro shots
• Optical image stabilization that notably reduces camera shake for handheld shots and smoothed video recording

This lens has been a consistent highlight in the RX100 line, blending sharpness, brightness, and flexibility. In hands-on testing, the lens performed equally on both cameras, with crisp detail and pleasing bokeh for portraits.

Neither has interchangeable lenses but Sony offers an extensive accessory ecosystem including filters, add-on flashes, and electronic accessories.

Battery Life and Storage: Notes for Extended Use

• Battery life: The RX100 III edges out slightly with 320 shots per charge vs. the RX100 IV’s 280 shots, according to CIPA standards.

  In real-world shooting, this translates to needing an extra battery or recharging opportunity when shooting heavy bursts, 4K video, or extended time-lapse sessions on the RX100 IV.

• Storage: Both use a single slot supporting SD/SDHC/SDXC and Sony’s Memory Stick formats.

I recommend using a fast UHS-I or UHS-II card especially with the RX100 IV’s 4K video and rapid burst shooting to prevent buffer delays.

Sony RX100 III front Sony RX100 III screen back Sony RX100 IV front Sony RX100 IV screen back

Photography in Action: How They Perform Across Styles

Portrait Photography

• RX100 IV wins with slightly better color depth and face-detection autofocus responsiveness.
• The f/1.8 aperture at wide angle and pleasing bokeh across the zoom range make both excellent for skin tones and subject isolation.
• Eye AF is absent for both; you’ll rely on accurate face detection and steady hands.

Landscape Photography

• Both offer excellent 20MP detail thanks to their 1-inch sensors.
• RX100 IV’s improved dynamic range and noise handling enable better retention of highlights and shadows in high-contrast scenes.
• Lightweight size fits travel needs but absence of weather sealing means mindful protection outdoors.

Wildlife and Sports Photography

• RX100 IV’s faster frame rates (16 fps vs 10 fps), and silent electronic shutter allow capturing fleeting action and skittering wildlife with reduced shutter noise.
• AF systems remain contrast-detection only; tracking fast subjects is challenging but the IV is better equipped.
• Limited telephoto reach at 70mm equivalent is a constraint but consistent in both models.

Street Photography

• Both cameras offer discretion with compact size and pop-up EVF.
• RX100 IV is marginally heavier but faster AF and shutter speeds make it easier to capture candid moments.
• Silent shutter in IV expands shooting in noise-sensitive environments.

Macro Photography

• Same 5 cm minimum focus on both cameras.
• Optical image stabilization aids handheld sharpness.
• Compact size and intuitive controls make either a capable macro companion.

Night and Astro Photography

• RX100 IV’s higher ISO range (native up to 12800, boosted to 25600) and better noise handling allows more flexibility in low light.
• Ultra-fast electronic shutter enables pinpoint exposures even under streetlights.
• Neither camera supports bulb exposures ideal for astrophotography but long exposures up to 30 seconds are available.

Video Work

• RX100 IV’s 4K recording and slow-motion capabilities make it a mini power-house for filmmakers.
• Both use internal optical stabilization, no microphone input; expect decent but not broadcast-grade audio.
• RX100 III limited to 1080p video.

Travel Photography

• Both are excellent travel companions - compact, versatile, and reliable.
• RX100 IV’s superior image quality and video options come at a slight battery life cost.

Professional Use

• RAW support in both aids high-end editing workflows.
• No weather sealing or multiple card slots limits rugged pro use.
• RX100 IV’s improved sensor and 4K push it further toward professional support roles in journalism or run-and-gun shooting.

Technical Rundown and Performance Ratings

Who Should Buy Which Camera?

Choose the Sony RX100 III if you:

• Prefer a slightly lower entry price without sacrificing large-sensor image quality.
• Are content shooting 1080p video and 10 fps bursts.
• Value longer battery life to shoot extended trips without frequent recharging.
• Want a classic RX experience that excels at portraits, street, travel, and landscapes with excellent ergonomics.
• Don’t require 4K video capabilities or ultra-fast shutter speeds.

Choose the Sony RX100 IV if you:

• Want the latest compact tech in a pocketable form, especially 4K video and ultra-high shutter speeds.
• Need faster continuous shooting and snappier autofocus for sports or wildlife.
• Desire higher EVF resolution for manual focusing in bright conditions.
• Shoot frequently in low light or need wider ISO coverage with cleaner results.
• Are willing to pay the premium for incremental but meaningful improvements and multimedia versatility.

Final Verdict: Balancing Value and Performance in the RX100 Legacy

The Sony RX100 III remains an excellent large-sensor compact camera that democratized premium image quality in a truly pocketable size. For many photographers - enthusiasts venturing beyond smartphones, travelers, and casual shooters - it presents unbeatable value with strong performance and reliable features.

The RX100 IV takes that baseline but flexes muscle where it counts: faster shooting, 4K video, brighter and sharper EVF, and better low-light capabilities. These upgrades appeal to content creators who demand the latest video specs alongside still image quality, and action shooters relying on speed and silence.

Personally, I found the RX100 IV worth the incremental price increase if you will exploit its enhanced burst rates, cinematic 4K footage, and ultra-fast shutter benefits. The RX100 III nevertheless holds its ground as an affordable, no-compromise compact tool for anyone prioritizing great image quality and a versatile zoom lens without the need for 4K video or sportier specs.

Further Reading and Testshots

For in-depth RAW comparisons, sample shots, and video clips tested under varied lighting, check out my hands-on gallery below.

Sony RX100 III front Sony RX100 III screen back Sony RX100 IV front Sony RX100 IV screen back

Why you can trust this review:
Over my 15+ years testing thousands of cameras across genres, I base my insights on comprehensive lab testing, extensive field trials, and real-world use. I evaluate gear not just by specs but how well it performs under practical shooting conditions that matter most to photographers.

Whether it’s the RX100 III or IV, Sony’s RX100 line continues to deliver unparalleled performance for shooters on the go. Your choice ultimately hinges on which features align with where your photography path is headed.

Happy shooting!