Canon EOS R3vs OM-1 IIvs A7 IV
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
Which should you buy?
Sports & Photojournalism Professionals — Canon EOS R3 (2021): The pinnacle of Canon's mirrorless lineup for speed — Eye Control AF and 30fps burst in the most rugged body Canon has ever produced.
Wildlife & Action — OM-1 II (2024): 120fps burst, 8-stop IBIS, and IP53 sealing — the most capable wildlife and action camera in the Micro Four Thirds world.
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.
Who should buy what
Canon EOS R3 (2021)
- You shoot sport, motorsport, wildlife, or news at a professional level
- You need Canon's most reliable and fastest autofocus available
- You need extreme weather sealing for demanding shooting conditions
OM-1 II (2024)
- You shoot wildlife, birds, or fast action and want the best MFT autofocus available
- You need strong weather sealing without the weight of a full-frame sports body
- You're in the MFT system and want a flagship-level body upgrade
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
Quick take: The a7 iv has the highest resolution at 33mp; the om-1 ii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | OM-1 II (2024) | A7 IV (2021) |
|---|---|---|---|
| Price | £5,999 | £1,499 | £2,299 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 20.4MP Micro Four Thirds Stacked BSI CMOS | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 24.1MP | 20.4MP | 33.0MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/120p Cinema4K, Apple ProRes RAW (with recorder) | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Quad-Pixel phase-detect, 1053 points, AI subject recognition (birds/animals) | 759-point phase-detect, AI subject recognition |
| Stabilisation | 8-stop IBIS | 5-axis IBIS, 8.0 stops (Dual IS) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 30fps electronic / 12fps mechanical | 120fps electronic (blackout-free), 15fps mechanical | 10fps mechanical, 30fps electronic |
| Battery Life | 620 shots (CIPA) | ~520 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 1015g body only | 561g body only | 659g body only |
| Dimensions | 150.0 × 142.6 × 87.2mm | 134.8 × 91.6 × 72.7mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | Yes | Yes | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | EVF, 5.76M dots, 0.83× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.2" fully articulating touchscreen | 3.0" fully articulating touchscreen | 3.0" vari-angle touchscreen |
| Mount | Canon RF | Micro Four Thirds | Sony FE (full-frame E-mount) |
| Memory Cards | Dual CFexpress Type B | Dual SD UHS-II slots | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C, Bluetooth, Wi-Fi | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
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