EOS R8vs A7 IVvs Sony A9 III
Which should you buy?
Full-Frame Entry — EOS R8 (2023): Canon's most affordable full-frame mirrorless — 4K/60p 10-bit and class-leading Dual Pixel AF at an accessible entry price.
Portrait & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
Sports & Action Professionals — Sony A9 III (2023): A paradigm-shifting camera — the global shutter eliminates every rolling shutter limitation that has constrained action photography for years.
Who should buy what
EOS R8 (2023)
- You want full-frame image quality on a tight budget
- You shoot mainly in good light and can live without built-in stabilisation
- You primarily shoot stills with occasional video
A7 IV (2021)
- You want a high-resolution full-frame all-rounder for portraits, weddings, or travel
- You're stepping up from APS-C or a DSLR and want the best all-round full-frame body under £3,000
- You shoot a mix of stills and video and need a single body that handles both seriously
- You want access to the widest lens ecosystem in the mirrorless market
Sony A9 III (2023)
- You shoot professional sport, motorsport, or action and need zero rolling shutter distortion
- You need reliable high-speed flash sync for studio or on-location action work
- You want the absolute pinnacle of Sony's action and sports camera technology
Quick take: The a7 iv has the highest resolution at 33mp; the eos r8 is the most affordable; only the a7 iv, sony a9 iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R8 (2023) | A7 IV (2021) | Sony A9 III (2023) |
|---|---|---|---|
| Price | £1,099 | £2,299 | £5,999 |
| Sensor | 24.2MP Full-frame BSI CMOS | 33MP Full-frame BSI Exmor R CMOS | 24.6MP full-frame Exmor RS CMOS (global shutter) |
| Resolution | 24.2MP | 33.0MP | 24.6MP |
| Video | 4K/60p oversampled 10-bit, FHD/180p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone | 4K/120p, 4K/60p, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II, 1053 zones, eye/face/subject tracking | 759-point phase-detect, AI subject recognition | AI subject recognition AF, 759-point phase-detect |
| Stabilisation | None (no IBIS) | 5-axis IBIS, 5.5 stops | 8-stop IBIS |
| Burst Rate | 6fps mechanical, 40fps electronic | 10fps mechanical, 30fps electronic | 120fps blackout-free electronic |
| Battery Life | ~220 shots (CIPA) | ~580 shots (CIPA) | 530 shots (CIPA) |
| Weight | 461g body only | 659g body only | 703g body only |
| Dimensions | 132.5 × 86.1 × 70.0mm | 131.3 × 96.4 × 79.8mm | 136.1 × 96.9 × 82.9mm |
| Weather Sealed | No | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.59× | EVF, 3.69M dots, 0.78× magnification | 0.64" Quad-XGA OLED EVF, 9.44M dots |
| Screen | 3.0" fully articulating touchscreen | 3.0" vari-angle touchscreen | 3.2" fully articulating touchscreen |
| Mount | Canon RF mount (full-frame) | Sony FE (full-frame E-mount) | Sony FE (E-mount) |
| Memory Cards | Single SD UHS-II slot | Dual slots: CFexpress Type A + SD UHS-II | Dual CFexpress Type A / SD UHS-II |
| Connectivity | USB-C, Bluetooth, Wi-Fi | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi | USB-C 3.2, HDMI A, Wi-Fi 6, Bluetooth 5.3 |
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