EOS R6 Mark IIIvs A7S III
Canon
EOS R6 Mark III (2025)
Starting from £2799 new
Best for Hybrid photo & video professionals, sports and wildlife shooters
View EOS R6 Mark III
Sony
A7S III (2020)
Starting from £2999 new
Best for Professional video & low-light filmmaking
View A7S III
GearScore™ Verdict — Which should you buy?
Hybrid Photo & Video Professionals, Sports And Wildlife Shooters — EOS R6 Mark III (2025): The EOS R6 Mark III takes everything that made the Mark II a hybrid favourite and pushes it further — a faster stacked sensor, smarter autofocus, and genuinely professional video specs. It's the most complete all-rounder in Canon's RF full-frame lineup, sitting just below the R5 II in resolution while matching it for speed.
Professional Video & Low-Light Filmmaking — A7S III (2020): If video is your primary discipline, the A7S III is the camera. 4K/120p at 10-bit in a weather-sealed body with a 9.44M dot EVF is an extraordinary package. The 12MP sensor isn't limiting for video — and it's usable at ISO 409,600 in a pinch.
Who should buy what
EOS R6 Mark III (2025)
- Working photographers who need a single body for both stills and serious video work
- Sports and wildlife shooters who need 40fps burst shooting with reliable subject tracking
- Hybrid content creators producing 4K and 6K footage alongside high-resolution stills
- Enthusiasts upgrading from the EOS R6 Mark II who want faster AF and more resolution
A7S III (2020)
- Filmmakers and videographers who need 4K/120p at 10-bit
- Event videographers who shoot in dark venues regularly
- Documentary filmmakers who need reliable AF and weather sealing
- Hybrid shooters where video is primary and stills are secondary
Quick take: The eos r6 mark iii has the highest resolution at 32mp; the eos r6 mark iii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R6 Mark III (2025) | A7S III (2020) |
|---|---|---|
| Price | £2,799 | £2,999 |
| Sensor | 32.5MP full-frame stacked CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 32.5MP | 12.1MP |
| Video | 4K 60fps oversampled from 7K, 6K RAW internal | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II — deep-learning subject detection for people, animals and vehicles, up to 40fps tracking | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | In-body 5-axis IS, up to 8.5 stops | 5.5-stop IBIS |
| Burst Rate | 40fps (electronic shutter), 12fps (mechanical) | 10fps mechanical |
| Battery Life | ~580 shots (CIPA, LP-E6P) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 670g (body with battery and card) | 699g (body, battery, card) |
| Dimensions | 138.4 × 98.4 × 88.4mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 5.76M-dot, up to 120fps | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.2-inch vari-angle touchscreen, 2.1M-dot | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Canon RF | Sony E-mount |
| Memory Cards | Dual SD / SDHC / SDXC (UHS-II) | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C, Wi-Fi 6, Bluetooth 5.0, 2.5GbE | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
Suitability by genre
| Genre | EOS R6 Mark III | A7S III |
|---|---|---|
| Sports & Action | — | |
| Wildlife | ||
| Vlogging & Video | — | |
| Portrait | ||
| Landscape | — | |
| Travel | ||
| Street | ||
| Casual | — | |
| Video | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
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Camera family history