Canon
EOS-1D X Mark III
Canon flagship DSLR for sports and news with 20fps and legendary reliability.
$6,499
Released Feb 2020
Sony
Alpha 7 IV
33MP hybrid all-rounder with 10-bit 4K 60p and AI-powered subject tracking.
$2,499
Released Oct 2021
Alpha 7 IV is 1.7 years newer.
Wins
EOS-1D X Mark III
Wins
Alpha 7 IV
6 categories tied
TL;DR — Key differences
- BAlpha 7 IV has higher RAW buffer depth (828 frames vs 200 frames)
- BAlpha 7 IV has higher Max video bit rate (600 Mbps vs 150 Mbps)
- BAlpha 7 IV has higher AF points / zones (759 vs 191)
- AEOS-1D X Mark III has higher ISO max (native) (102,400 vs 51,200)
- AEOS-1D X Mark III has higher Burst (electronic) (20 fps vs 10 fps)
Key specs at a glance
Size and weight, to scale
EOS-1D X Mark III
138 × 98 × 88 mm
720 g (1.59 lb / 25.40 oz)
Alpha 7 IV
131 × 96 × 80 mm
658 g (1.45 lb / 23.21 oz)
EOS-1D X Mark III is 7mm wider, 2mm taller, and 8mm thicker than Alpha 7 IV.
EOS-1D X Mark III is 62 g heavier than Alpha 7 IV.
Depth (front-to-back): 88mm EOS-1D X Mark III · 80mm Alpha 7 IV
Sensor size, to scale
EOS-1D X Mark III
36 × 24 mm · Full Frame
864 mm² area
Alpha 7 IV
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
EOS-1D X Mark III
Canon EF
300+
native lenses available
Alpha 7 IV
✓ more lensesSony E
350+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
EOS-1D X Mark III
Dimensions (W×H×D mm)
Adds 138, 98, 88
ISO max (native)
102,400 vs 51,200 — higher is better
Burst (electronic)
20 fps vs 10 fps — higher is better
Pre-Capture / Pre-Release
Only EOS-1D X Mark III supports it
Card types
Adds CFexpress Type B
Burst (mechanical)
16 fps vs 10 fps — higher is better
EVF resolution
5,760,000 vs 3,686,400 — higher is better
Codecs
Adds RAW
Reasons to choose
Alpha 7 IV
Dimensions (W×H×D mm)
Adds 131.3, 96.4, 79.8
RAW buffer depth
828 frames vs 200 frames — higher is better
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
AF points / zones
759 vs 191 — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Animal / bird AF
Only Alpha 7 IV supports it
Subject recognition
Adds Insect, Car/Train, Airplane
Card types
Adds CFexpress Type A
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓4K max frame rate — Both 60 fps
- ✓Internal RAW video — Both support internal raw video
- ✓In-body stabilization — Both support in-body stabilization
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS-1D X Mark III
Pros
- ✓20fps DSLR
- ✓Pro build
- ✓Dual CFexpress
- ✓Excellent AF
Cons
- –DSLR platform
- –20MP
- –Very heavy
Alpha 7 IV
Pros
- ✓33MP — more detail for cropping and print
- ✓10-bit 4K 60p (Super35 crop) / 4K 30p full-frame
- ✓Full-size HDMI port
- ✓759 phase-detect AF points
Cons
- –4K 60p requires Super35 crop
- –10fps burst lags behind R6 II at 40fps
- –Complex menu system
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for portraits, EOS-1D X Mark III or Alpha 7 IV?
Alpha 7 IV scores 9.0/10 versus 6.5/10 for EOS-1D X Mark III — 33MP — ample resolution for portraits.
What's the resolution difference between the EOS-1D X Mark III and Alpha 7 IV?
EOS-1D X Mark III is 20.1 MP and Alpha 7 IV is 33 MP, so the Alpha 7 IV captures more detail for cropping and large prints.
Do the EOS-1D X Mark III and Alpha 7 IV have in-body image stabilization?
EOS-1D X Mark III has 8-stop in-body image stabilization, while alpha 7 IV has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS-1D X Mark III or the Alpha 7 IV?
EOS-1D X Mark III reaches 20 fps electronic. Alpha 7 IV reaches 10 fps electronic.
What's the weight difference between the EOS-1D X Mark III and Alpha 7 IV?
EOS-1D X Mark III weighs 720 g and Alpha 7 IV weighs 658 g, so the Alpha 7 IV is 62 g lighter.
Do the EOS-1D X Mark III and Alpha 7 IV record 4K video?
EOS-1D X Mark III: 4K up to 60p. Alpha 7 IV: 4K up to 60p.
Are the EOS-1D X Mark III and Alpha 7 IV weather sealed?
EOS-1D X Mark III: Yes. Alpha 7 IV: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the EOS-1D X Mark III and 580 shots for the Alpha 7 IV, giving the Alpha 7 IV the edge.
How much does each cost?
EOS-1D X Mark III launched at $6,499 and Alpha 7 IV at $2,499. The Alpha 7 IV is $4,000 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.