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
Launch priceReleased Nov 2025
Sony
Alpha 7S III
12MP low-light video specialist with 4K 120p, 16-bit RAW HDMI, and excellent autofocus.
$3,499
Launch priceReleased Sep 2020
EOS R6 Mark III is 5.2 years newer.
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Wins
EOS R6 Mark III
Wins
Alpha 7S III
4 categories tied
TL;DR — Key differences
- AEOS R6 Mark III has higher Max video bit rate (2600 Mbps vs 600 Mbps)
- AEOS R6 Mark III has higher Burst (electronic) (40 fps vs 10 fps)
- AEOS R6 Mark III has higher Resolution (32.5 MP vs 12.1 MP)
- BAlpha 7S III has higher EVF resolution (9,437,184 vs 3,690,000)
- BAlpha 7S III has higher ISO max (native) (102,400 vs 64,000)
Key specs at a glance
Size and weight, to scale
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
Alpha 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
EOS R6 Mark III is 10mm wider, 2mm taller, and 8mm thicker than Alpha 7S III.
EOS R6 Mark III and Alpha 7S III weigh the same.
Depth (front-to-back): 88mm EOS R6 Mark III · 81mm Alpha 7S III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark III
138 × 98 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 R6 Mark III
138 × 88 mm
Alpha 7S III
129 × 81 mm
Sensor size, to scale
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7S III
35.6 × 23.8 mm · Full Frame
847 mm² area
Lens ecosystem
Native lens selection
EOS R6 Mark III
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 R6 Mark III
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 600 Mbps — higher is better
Burst (electronic)
40 fps vs 10 fps — higher is better
Resolution
32.5 MP vs 12.1 MP — higher is better
Codecs
Adds CRM, XF-HEVC S, XF-AVC S
AF low-light limit
-6.5 EV vs -6 EV — lower is better
Pre-Capture / Pre-Release
Only EOS R6 Mark III 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
EVF resolution
9,437,184 vs 3,690,000 — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Card types
Adds CFexpress Type A
ISO max (native)
102,400 vs 64,000 — higher is better
ISO min (native)
80 vs 100 — lower is better
EVF magnification
0.9 × vs 0.76 × — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓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
- ✓In-body stabilization — Both support in-body stabilization
Pros & cons at a glance
Editorially curated highlights and trade-offs.
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
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
Decided which one is right for you?
Compare live prices for the EOS R6 Mark III and Alpha 7S III at major authorized retailers.
Canon EOS R6 Mark III
Sony Alpha 7S III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, EOS R6 Mark III or Alpha 7S III?
EOS R6 Mark III 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 R6 Mark III and Alpha 7S III?
EOS R6 Mark III is 32.5 MP and Alpha 7S III is 12.1 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS R6 Mark III and Alpha 7S III have in-body image stabilization?
EOS R6 Mark III 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 R6 Mark III or the Alpha 7S III?
EOS R6 Mark III reaches 40 fps electronic. Alpha 7S III reaches 10 fps electronic.
What's the weight difference between the EOS R6 Mark III and Alpha 7S III?
Both bodies weigh roughly 699 g.
Do the EOS R6 Mark III and Alpha 7S III record 4K video?
EOS R6 Mark III: 4K up to 120p. Alpha 7S III: 4K up to 120p.
Are the EOS R6 Mark III and Alpha 7S III weather sealed?
EOS R6 Mark III: Yes. Alpha 7S III: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS R6 Mark III and 600 shots for the Alpha 7S III, giving the EOS R6 Mark III the edge.
How much does each cost?
EOS R6 Mark III launched at $2,799 and Alpha 7S III at $3,499. The EOS R6 Mark III is $700 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.