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 R5
45MP full-frame hybrid with 8K RAW, 4K 120p, strong AF, and 8-stop in-body stabilization.
$3,899
Released Jul 2020
EOS R5 is 5 months newer.
Wins
EOS-1D X Mark III
Wins
EOS R5
7 categories tied
TL;DR — Key differences
- BEOS R5 has higher Max video bit rate (2600 Mbps vs 150 Mbps)
- BEOS R5 has higher AF points / zones (1053 vs 191)
- BEOS R5 has higher Resolution (45 MP vs 20.1 MP)
- AEOS-1D X Mark III has higher ISO max (native) (102,400 vs 51,200)
- BEOS R5 has higher 4K max frame rate (120 fps vs 60 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)
EOS R5
139 × 98 × 88 mm
738 g (1.63 lb / 26.03 oz)
EOS-1D X Mark III is 1mm narrower than EOS R5 but it is also 1mm taller.
EOS-1D X Mark III is 18 g lighter than EOS R5.
Depth (front-to-back): 88mm EOS-1D X Mark III · 88mm EOS R5
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS-1D X Mark III
138 × 98 mm
EOS R5
139 × 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 R5
139 × 88 mm
Sensor size, to scale
EOS-1D X Mark III
36 × 24 mm · Full Frame
864 mm² area
EOS R5
36 × 24 mm · Full Frame
864 mm² area
Lens ecosystem
Native lens selection
EOS-1D X Mark III
✓ more lensesCanon EF
300+
native lenses available
EOS R5
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
ISO max (native)
102,400 vs 51,200 — higher is better
Pre-Capture / Pre-Release
Only EOS-1D X Mark III supports it
Burst (mechanical)
16 fps vs 12 fps — higher is better
RAW buffer depth
200 frames vs 180 frames — higher is better
Battery life (CIPA)
520 shots vs 490 shots — higher is better
Weight
720 g vs 738 g — lower is better
Reasons to choose
EOS R5
AF low-light limit
-6 EV vs -4 EV — lower is better
Subject recognition
Adds People, Dogs, Cats…
Max video bit rate
2600 Mbps vs 150 Mbps — higher is better
AF points / zones
1053 vs 191 — higher is better
Dimensions (W×H×D mm)
Adds 138.5, 97.5
Resolution
45 MP vs 20.1 MP — higher is better
Animal / bird AF
Only EOS R5 supports it
4K max frame rate
120 fps vs 60 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
- ✓Burst (electronic) — Both 20 fps
- ✓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 R5
Pros
- ✓45MP sensor balances resolution and speed
- ✓8K RAW and 4K 120p internal video
- ✓Dual Pixel CMOS AF II with advanced subject tracking
- ✓8-stop IBIS
- ✓CFexpress Type B plus SD UHS-II storage
Cons
- –Heat limits can matter for extended high-end video
- –Battery life is modest
- –Still expensive versus newer enthusiast bodies
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, EOS-1D X Mark III or EOS R5?
EOS-1D X Mark III scores 10.0/10 versus 5.0/10 for EOS R5 — 20fps burst captures fleeting moments.
What's the resolution difference between the EOS-1D X Mark III and EOS R5?
EOS-1D X Mark III is 20.1 MP and EOS R5 is 45 MP, so the EOS R5 captures more detail for cropping and large prints.
Do the EOS-1D X Mark III and EOS R5 have in-body image stabilization?
EOS-1D X Mark III has 8-stop in-body image stabilization, while eOS R5 has 8-stop in-body image stabilization.
Which shoots faster bursts — the EOS-1D X Mark III or the EOS R5?
EOS-1D X Mark III reaches 20 fps electronic. EOS R5 reaches 20 fps electronic.
What's the weight difference between the EOS-1D X Mark III and EOS R5?
EOS-1D X Mark III weighs 720 g and EOS R5 weighs 738 g, so the EOS-1D X Mark III is 18 g lighter.
Do the EOS-1D X Mark III and EOS R5 record 4K video?
EOS-1D X Mark III: 4K up to 60p. EOS R5: 8K RAW (max), 4K up to 120p.
Are the EOS-1D X Mark III and EOS R5 weather sealed?
EOS-1D X Mark III: Yes. EOS R5: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the EOS-1D X Mark III and 490 shots for the EOS R5, giving the EOS-1D X Mark III the edge.
How much does each cost?
EOS-1D X Mark III launched at $6,499 and EOS R5 at $3,899. The EOS R5 is $2,600 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon press materials.