Canon
EOS-1D X Mark III
Canon flagship DSLR for sports and news with 20fps and legendary reliability.
$6,499
Released Feb 2020
Canon
EOS R6 Mark III
Hybrid 32.5MP full-frame RF body with 7K RAW video, 40fps electronic burst, 8.5-stop IBIS, and Dual Pixel CMOS AF II.
$2,799
Released Nov 2025
EOS R6 Mark III is 5.8 years newer.
Wins
EOS-1D X Mark III
Wins
EOS R6 Mark III
4 categories tied
TL;DR — Key differences
- BEOS R6 Mark III has higher Max video bit rate (2600 Mbps vs 150 Mbps)
- BEOS R6 Mark III has higher AF points / zones (1053 vs 191)
- BEOS R6 Mark III has higher Burst (electronic) (40 fps vs 20 fps)
- BEOS R6 Mark III has higher 4K max frame rate (120 fps vs 60 fps)
- BEOS R6 Mark III has higher Resolution (32.5 MP vs 20.1 MP)
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)
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
EOS-1D X Mark III and EOS R6 Mark III share virtually identical body dimensions.
EOS-1D X Mark III is 21 g heavier than EOS R6 Mark III.
Depth (front-to-back): 88mm EOS-1D X Mark III · 88mm EOS R6 Mark III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS-1D X Mark III
138 × 98 mm
EOS R6 Mark III
138 × 98 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS-1D X Mark III
138 × 88 mm
EOS R6 Mark III
138 × 88 mm
Sensor size, to scale
EOS-1D X Mark III
36 × 24 mm · Full Frame
864 mm² area
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
EOS-1D X Mark III
✓ more lensesCanon EF
300+
native lenses available
EOS R6 Mark III
Canon RF
105+
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
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 138, 98, 88
ISO max (native)
102,400 vs 64,000 — higher is better
EVF resolution
5,760,000 vs 3,690,000 — higher is better
Codecs
Adds RAW
Burst (mechanical)
16 fps vs 12 fps — higher is better
RAW buffer depth
200 frames vs 150 frames — higher is better
EVF magnification
0.78 × vs 0.76 × — higher is better
Reasons to choose
EOS R6 Mark III
AF low-light limit
-6.5 EV vs -4 EV — lower is better
Subject recognition
Adds People, Dogs, Cats…
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Max video bit rate
2600 Mbps vs 150 Mbps — higher is better
AF points / zones
1053 vs 191 — higher is better
Codecs
Adds CRM, XF-HEVC S, XF-AVC S
Animal / bird AF
Only EOS R6 Mark III supports it
Burst (electronic)
40 fps vs 20 fps — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓Internal RAW video — Both support internal raw video
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
EOS R6 Mark III
Pros
- ✓32.5MP full-frame sensor
- ✓7K RAW video & 4K 120p
- ✓40fps electronic burst with Pre-Continuous
- ✓8.5-stop IBIS
Cons
- –Single CFexpress Type B + SD slot
- –Smaller LCD than R5 II
- –LP-E6P required for full features
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, EOS-1D X Mark III or EOS R6 Mark III?
EOS-1D X Mark III scores 10.0/10 versus 6.5/10 for EOS R6 Mark III — 20fps burst captures fleeting moments.
What's the resolution difference between the EOS-1D X Mark III and EOS R6 Mark III?
EOS-1D X Mark III is 20.1 MP and EOS R6 Mark III is 32.5 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS-1D X Mark III and EOS R6 Mark III have in-body image stabilization?
EOS-1D X Mark III has 8-stop in-body image stabilization, while eOS R6 Mark III has 8.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS-1D X Mark III or the EOS R6 Mark III?
EOS-1D X Mark III reaches 20 fps electronic. EOS R6 Mark III reaches 40 fps electronic.
What's the weight difference between the EOS-1D X Mark III and EOS R6 Mark III?
EOS-1D X Mark III weighs 720 g and EOS R6 Mark III weighs 699 g, so the EOS R6 Mark III is 21 g lighter.
Do the EOS-1D X Mark III and EOS R6 Mark III record 4K video?
EOS-1D X Mark III: 4K up to 60p. EOS R6 Mark III: 4K up to 120p.
Are the EOS-1D X Mark III and EOS R6 Mark III weather sealed?
EOS-1D X Mark III: Yes. EOS R6 Mark III: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the EOS-1D X Mark III and 640 shots for the EOS R6 Mark III, giving the EOS R6 Mark III the edge.
How much does each cost?
EOS-1D X Mark III launched at $6,499 and EOS R6 Mark III at $2,799. The EOS R6 Mark III is $3,700 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon press materials.