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EOS-1D X Mark IIIvs A7R III

GearFrame · Updated March 2026

Canon EOS-1D X Mark III Canon EOS-1D X Mark III (2020) Starting from £3500 new Best for Professional Sports, Wildlife & Press Photography View EOS-1D X Mark III
VS
Sony A7R III Sony A7R III (2017) Starting from £1799 new Best for Landscape, studio & commercial photography View A7R 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 Photography — A7R III (2017): The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.

↓ Full specifications below

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 III (2017)

  • Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
  • Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
  • Commercial and product photographers who want full-frame resolution with IBIS for handheld work
  • Portrait photographers who want the sharpest possible full-frame files for large print work

Quick take: The a7r iii has the highest resolution at 42mp; the a7r iii is the most affordable. Scroll down for the full spec breakdown.

Full specifications

Specification EOS-1D X Mark III (2020)A7R III (2017)
Price £3,500 £1,799
Sensor 20.1MP full-frame CMOS 42.4MP full-frame BSI Exmor R CMOS
Resolution 20.1MP 42.4MP
Video 5.5K RAW, 4K 60fps (crop), 4K 60fps (full-frame via firmware) 4K/30p (full-frame readout), 1080p/120p
Autofocus 191-point all cross-type OVF AF; 525-point Dual Pixel CMOS AF (Live View) 399 phase-detect + 425 contrast AF points — real-time Eye AF
Stabilisation 5-axis IBIS — 5.5 stops
Burst Rate 16fps mechanical, 20fps live view 10fps with AF/AE tracking
Battery Life ~2850 shots (CIPA) ~650 shots (CIPA)
Weight 1250g (body only) 650g body only
Dimensions 158 × 167.6 × 82.6mm 126.9 × 95.6 × 73.7mm
Weather Sealed Yes Yes
Viewfinder OVF 0.76× magnification, 100% coverage EVF, 3.69M dots, 0.78× magnification
Screen 3.2" fully articulating touchscreen, 4.15M dots 3.0" touchscreen, tilting
Mount Canon EF Sony FE mount (full-frame E-mount)
Memory Cards Dual CFexpress Type B slots Dual SD slots (one UHS-II)
Connectivity Wi-Fi 5GHz, Bluetooth 4.2, USB-C 3.1 Gen 2, Ethernet USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack
Genre EOS-1D X Mark IIIA7R III
Sports & Action
10.0
Wildlife
9.0
Wedding & Events
9.0
Portrait
8.0
9.0
Vlogging & Video
7.0
7.0
Street
7.0
7.0
Landscape
7.0
9.0
Wedding
7.0
Sports
4.0

GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →

⚡ Compare specs side by side EOS-1D X Mark III prices → A7R III prices →

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