Canon
EOS R1
Flagship 24.2MP full-frame BSI stacked RF body with 40fps burst, Dual Pixel Intelligent AF, 6K RAW, and 9.44M-dot EVF.
$6,299
Released Jul 2024
Sony
Alpha 7R III
42MP workhorse for landscape and studio before the A7R IV/V era.
$3,199
Released Oct 2017
EOS R1 is 6.8 years newer.
Wins
EOS R1
Wins
Alpha 7R III
2 categories tied
TL;DR — Key differences
- AEOS R1 has higher Burst (electronic) (40 fps vs 10 fps)
- AEOS R1 has higher 4K max frame rate (120 fps vs 30 fps)
- AEOS R1 has higher ISO max (native) (102,400 vs 32,000)
- AEOS R1 has higher AF points / zones (1053 vs 399)
- AEOS R1 has higher EVF resolution (9,440,000 vs 3,686,400)
Key specs at a glance
Size and weight, to scale
EOS R1
158 × 150 × 87 mm
1115 g (2.46 lb / 39.33 oz)
Alpha 7R III
127 × 96 × 74 mm
657 g (1.45 lb / 23.18 oz)
EOS R1 is 31mm wider, 54mm taller, and 14mm thicker than Alpha 7R III.
EOS R1 is 458 g heavier than Alpha 7R III.
Depth (front-to-back): 87mm EOS R1 · 74mm Alpha 7R III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R1
158 × 150 mm
Alpha 7R III
127 × 96 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R1
158 × 87 mm
Alpha 7R III
127 × 74 mm
Sensor size, to scale
EOS R1
36 × 24 mm · Full Frame
864 mm² area
Alpha 7R III
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
EOS R1
Canon RF
105+
native lenses available
Alpha 7R III
✓ 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 R1
AF low-light limit
-7.5 EV vs -3 EV — lower is better
Subject recognition
Adds People, Dogs, Cats…
Dimensions (W×H×D mm)
Adds 157.6, 149.5, 87.3
Card types
Adds CFexpress Type B, CFexpress Type B
Codecs
Adds RAW, XF-HEVC S, XF-AVC S…
Burst (electronic)
40 fps vs 10 fps — higher is better
4K max frame rate
120 fps vs 30 fps — higher is better
ISO max (native)
102,400 vs 32,000 — higher is better
Reasons to choose
Alpha 7R III
Subject recognition
Adds Human, Animal
Dimensions (W×H×D mm)
Adds 126.9, 95.6, 73.7
Card types
Adds SD UHS-II, SD UHS-I
Codecs
Adds XAVC S, AVCHD
Resolution
42.4 MP vs 24.2 MP — higher is better
Weight
657 g vs 1115 g — lower is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Weather sealing — Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R1
Pros
- ✓40fps electronic burst
- ✓24.2MP BSI stacked full-frame sensor
- ✓Dual Pixel Intelligent AF
- ✓6K RAW and 4K 120p video
- ✓Dual CFexpress Type B slots
Cons
- –24MP resolution
- –Very expensive
- –Large integrated-grip body
Alpha 7R III
Pros
- ✓42MP proven
- ✓10fps with AF
- ✓Dual slots
- ✓Great used value
Cons
- –Superseded
- –No 8K
- –Older AF
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, EOS R1 or Alpha 7R III?
EOS R1 scores 8.5/10 versus 3.5/10 for Alpha 7R III — 40fps burst — pro-level action capture.
What's the resolution difference between the EOS R1 and Alpha 7R III?
EOS R1 is 24.2 MP and Alpha 7R III is 42.4 MP, so the Alpha 7R III captures more detail for cropping and large prints.
Do the EOS R1 and Alpha 7R III have in-body image stabilization?
EOS R1 has 8.5-stop in-body image stabilization, while alpha 7R III has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS R1 or the Alpha 7R III?
EOS R1 reaches 40 fps electronic. Alpha 7R III reaches 10 fps electronic.
What's the weight difference between the EOS R1 and Alpha 7R III?
EOS R1 weighs 1115 g and Alpha 7R III weighs 657 g, so the Alpha 7R III is 458 g lighter.
Do the EOS R1 and Alpha 7R III record 4K video?
EOS R1: 6K RAW (max), 4K up to 120p. Alpha 7R III: 4K up to 30p.
Are the EOS R1 and Alpha 7R III weather sealed?
EOS R1: Yes. Alpha 7R III: Yes.
How much does each cost?
EOS R1 launched at $6,299 and Alpha 7R III at $3,199. The Alpha 7R III is $3,100 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.