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 7S III
12MP low-light video specialist with 4K 120p, 16-bit RAW HDMI, and excellent autofocus.
$3,499
Released Sep 2020
EOS R1 is 3.8 years newer.
Wins
EOS R1
Wins
Alpha 7S III
4 categories tied
TL;DR — Key differences
- AEOS R1 has higher Burst (electronic) (40 fps vs 10 fps)
- AEOS R1 has higher Resolution (24.2 MP vs 12.1 MP)
- BAlpha 7S III has lower Weight (699 g vs 1115 g)
- AEOS R1 has higher IBIS effectiveness (8.5 stops vs 5.5 stops)
- AEOS R1 has higher AF points / zones (1053 vs 759)
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 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
EOS R1 is 29mm wider, 53mm taller, and 7mm thicker than Alpha 7S III.
EOS R1 is 416 g heavier than Alpha 7S III.
Depth (front-to-back): 87mm EOS R1 · 81mm Alpha 7S III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R1
158 × 150 mm
Alpha 7S III
129 × 97 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R1
158 × 87 mm
Alpha 7S III
129 × 81 mm
Sensor size, to scale
EOS R1
36 × 24 mm · Full Frame
864 mm² area
Alpha 7S III
35.6 × 23.8 mm · Full Frame
847 mm² area
Lens ecosystem
Native lens selection
EOS R1
Canon RF
105+
native lenses available
Alpha 7S 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 -6 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
Burst (electronic)
40 fps vs 10 fps — higher is better
Codecs
Adds RAW, XF-HEVC S, XF-AVC S
Resolution
24.2 MP vs 12.1 MP — higher is better
Pre-Capture / Pre-Release
Only EOS R1 supports it
Reasons to choose
Alpha 7S III
Subject recognition
Adds Human, Animal
Dimensions (W×H×D mm)
Adds 128.9, 96.9, 80.8
Card types
Adds CFexpress Type A, SD UHS-II
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Weight
699 g vs 1115 g — lower is better
ISO min (native)
80 vs 100 — lower is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO max (native) — Both 102,400
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓4K max frame rate — Both 120 fps
- ✓Internal RAW video — Both support internal raw video
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 7S III
Pros
- ✓Best-in-class low light
- ✓4K 120p
- ✓Full-size HDMI
- ✓Strong IBIS
Cons
- –12MP stills limit
- –Older generation now
- –No 8K
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, EOS R1 or Alpha 7S III?
EOS R1 scores 8.5/10 versus 4.0/10 for Alpha 7S III — 40fps burst — pro-level action capture.
What's the resolution difference between the EOS R1 and Alpha 7S III?
EOS R1 is 24.2 MP and Alpha 7S III is 12.1 MP, so the EOS R1 captures more detail for cropping and large prints.
Do the EOS R1 and Alpha 7S III have in-body image stabilization?
EOS R1 has 8.5-stop in-body image stabilization, while alpha 7S III has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS R1 or the Alpha 7S III?
EOS R1 reaches 40 fps electronic. Alpha 7S III reaches 10 fps electronic.
What's the weight difference between the EOS R1 and Alpha 7S III?
EOS R1 weighs 1115 g and Alpha 7S III weighs 699 g, so the Alpha 7S III is 416 g lighter.
Do the EOS R1 and Alpha 7S III record 4K video?
EOS R1: 6K RAW (max), 4K up to 120p. Alpha 7S III: 4K up to 120p.
Are the EOS R1 and Alpha 7S III weather sealed?
EOS R1: Yes. Alpha 7S III: Yes.
How much does each cost?
EOS R1 launched at $6,299 and Alpha 7S III at $3,499. The Alpha 7S III is $2,800 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.