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Canon EOS R8 Mark II vs A7S III

Quick take: The Canon EOS R8 Mark II has the highest resolution at 24MP; the Canon EOS R8 Mark II is the most affordable.

16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras

How to read this page. Highlighted cells win that row on the spec alone. Genre scores are the engine's base scores (enthusiast, photo and video); Camera Match re-weights them for your level and priorities. Price buttons are affiliate links; the price you pay is the same.

Price buttons are affiliate links — GearFrame may earn a commission at no extra cost to you. It never affects a score. Learn more

Verdictwhich should you buy?

A7S III — Professional Video & Low-Light Filmmaking: 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
A7S III (2020)
is the right camera for you if…
  • 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
Full specificationsthe better value in each row is highlighted
Specification Canon EOS R8 Mark IICanon · 2026A7S IIISony · 2020
Price £1,729Best£3,389
Sensor 24.2MP full-frame CMOS12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated)
Resolution 24.2MPBest12.1MP
Video 4K/60p oversampled from 6K, 10-bit Canon Log 3/HLG4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p
Autofocus Dual Pixel CMOS AF II with subject detection (people/animals/vehicles)Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition
Stabilisation 7.5-stop IBIS5.5-stop IBIS
Burst Rate 40fps electronicBest10fps mechanical
Battery Life 150 shots (CIPA, via EVF)~600 shots (CIPA) / ~70min continuous 4K recordingBest
Weight 546g (with battery and card)Best699g (with battery and card)
Dimensions —128.9 × 96.9 × 80.8mm
Weather Sealed YesYes
Viewfinder EVF, 2.36M dotsOLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made
Screen Vari-angle touchscreen3.0" vari-angle touchscreen, 1.44M dots
Mount Canon RF-mountSony E-mount
Memory Cards Single SD (UHS-II)Dual CFexpress Type A / SD UHS-II (both slots)
Connectivity USB-C, HDMI (micro), Wi-Fi, BluetoothUSB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth

Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.

How they score by genreengine base scores out of 10
Genre
Canon EOS R8 Mark II
A7S III
Portrait
8.3/10
7.5/10
Street
6.9/10
6.2/10
Travel
6.6/10
6.2/10
Wedding & Events
7.1/10
7.5/10
Vlogging & Video
6.7/10
6.1/10
Filmmaking
7.0/10
8.2/10
Documentary
7.7/10
7.7/10
Sports & Action
8.0/10
7.4/10
Landscape
6.4/10
5.5/10
Wildlife
8.3/10
7.5/10
Casual
5.8/10
4.9/10
Food
8.0/10
6.8/10
Macro
8.5/10
5.8/10
Architecture
6.6/10
5.5/10
Astrophotography
6.3/10
7.8/10

Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →

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