EOS-1D X Mark IIIvs A7R IV
Canon
EOS-1D X Mark III (2020)
Starting from £3500 new
Best for Professional Sports, Wildlife & Press Photography
View EOS-1D X Mark III
GearScore™ Verdict — Which should you buy?
Professional Sports, Wildlife & Press Photography — EOS-1D X Mark III (2020): Canon's DSLR masterpiece — 20fps live view, 5.5K RAW, 191 cross-type AF points, and dual CFexpress. Almost certainly the finest optical viewfinder camera ever made.
Landscape, Studio, Commercial — A7R IV (2019): 61MP in a mirrorless body — the resolution benchmark.
Who should buy what
EOS-1D X Mark III (2020)
- Sports and wildlife photographers with a Canon EF lens collection
- Professionals who prefer the optical viewfinder experience
- Press photographers who need 20fps, weather sealing, and Ethernet
- Canon historians who want to mark the end of the EOS-1D DSLR era
A7R IV (2019)
- Landscape photographers who print large
- Studio shooters needing maximum detail
Quick take: The a7r iv has the highest resolution at 61mp; the a7r iv is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS-1D X Mark III (2020) | A7R IV (2019) |
|---|---|---|
| Price | £3,500 | £2,199 |
| Sensor | 20.1MP full-frame CMOS | Full-frame BSI Exmor R CMOS 35mm |
| Resolution | 20.1MP | 61.0MP |
| Video | 5.5K RAW, 4K 60fps (crop), 4K 60fps (full-frame via firmware) | 4K 30fps |
| Autofocus | 191-point all cross-type OVF AF; 525-point Dual Pixel CMOS AF (Live View) | 567-point phase-detect, real-time tracking |
| Stabilisation | — | 5-axis IBIS, 5.5 stops |
| Burst Rate | 16fps mechanical, 20fps live view | 10fps |
| Battery Life | ~2850 shots (CIPA) | 670 shots (CIPA) |
| Weight | 1250g (body only) | 665g (body only) |
| Dimensions | 158 × 167.6 × 82.6mm | 128.9 × 96.4 × 77.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | OVF 0.76× magnification, 100% coverage | EVF 0.78× 5.76M-dot |
| Screen | 3.2" fully articulating touchscreen, 4.15M dots | 3.0" tilting touchscreen, 1.44M-dot |
| Mount | Canon EF | Sony E-Mount |
| Memory Cards | Dual CFexpress Type B slots | 2× SD UHS-II / CFexpress Type A |
| Connectivity | Wi-Fi 5GHz, Bluetooth 4.2, USB-C 3.1 Gen 2, Ethernet | Wi-Fi 5GHz, Bluetooth 4.1, USB-C 3.2 |
Suitability by genre
| Genre | EOS-1D X Mark III | A7R IV |
|---|---|---|
| Sports & Action | — | |
| Wildlife | ||
| Wedding & Events | ||
| Portrait | ||
| Vlogging & Video | ||
| Street | ||
| Landscape | ||
| Architecture | — | |
| Travel | — |
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