Canon
EOS R6 Mark II
Versatile 24.2MP full-frame hybrid with class-leading AF and 4K 60p video.
$2,499
Released Nov 2022
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 R6 Mark II is 2.3 years newer.
Wins
EOS R6 Mark II
Wins
Alpha 7S III
3 categories tied
TL;DR — Key differences
- AEOS R6 Mark II has higher Burst (electronic) (40 fps vs 10 fps)
- BAlpha 7S III has higher EVF resolution (9,437,184 vs 3,690,000)
- AEOS R6 Mark II has higher Resolution (24.2 MP vs 12.1 MP)
- BAlpha 7S III has higher 4K max frame rate (120 fps vs 60 fps)
- BAlpha 7S III has higher Max video bit rate (600 Mbps vs 340 Mbps)
Key specs at a glance
Size and weight, to scale
EOS R6 Mark II
138 × 98 × 88 mm
680 g (1.50 lb / 23.99 oz)
Alpha 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
EOS R6 Mark II is 10mm wider, 2mm taller, and 8mm thicker than Alpha 7S III.
EOS R6 Mark II is 19 g lighter than Alpha 7S III.
Depth (front-to-back): 88mm EOS R6 Mark II · 81mm Alpha 7S III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark II
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 II
138 × 88 mm
Alpha 7S III
129 × 81 mm
Sensor size, to scale
EOS R6 Mark II
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 II
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 II
Subject recognition
Adds People, Dogs, Cats…
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Burst (electronic)
40 fps vs 10 fps — higher is better
Resolution
24.2 MP vs 12.1 MP — higher is better
AF low-light limit
-6.5 EV vs -6 EV — lower is better
Pre-Capture / Pre-Release
Only EOS R6 Mark II supports it
RAW buffer depth
180 frames vs 120 frames — higher is better
IBIS effectiveness
8 stops vs 5.5 stops — higher is better
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
4K max frame rate
120 fps vs 60 fps — higher is better
Card types
Adds CFexpress Type A
Max video bit rate
600 Mbps vs 340 Mbps — higher 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
- ✓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 II
Pros
- ✓Up to 40fps electronic burst
- ✓4K 60p oversampled from 6K
- ✓Dual Pixel CMOS AF II — superb subject tracking
- ✓8-stop IBIS
- ✓Fully articulating touchscreen
Cons
- –24.2MP may feel limiting for large prints
- –No CFexpress on base body
- –Short battery life vs. A7 IV
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 R6 Mark II or Alpha 7S III?
EOS R6 Mark II 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 II and Alpha 7S III?
EOS R6 Mark II is 24.2 MP and Alpha 7S III is 12.1 MP, so the EOS R6 Mark II captures more detail for cropping and large prints.
Do the EOS R6 Mark II and Alpha 7S III have in-body image stabilization?
EOS R6 Mark II has 8-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 II or the Alpha 7S III?
EOS R6 Mark II reaches 40 fps electronic. Alpha 7S III reaches 10 fps electronic.
What's the weight difference between the EOS R6 Mark II and Alpha 7S III?
EOS R6 Mark II weighs 680 g and Alpha 7S III weighs 699 g, so the EOS R6 Mark II is 19 g lighter.
Do the EOS R6 Mark II and Alpha 7S III record 4K video?
EOS R6 Mark II: 4K up to 60p. Alpha 7S III: 4K up to 120p.
Are the EOS R6 Mark II and Alpha 7S III weather sealed?
EOS R6 Mark II: Yes. Alpha 7S III: Yes.
Which has better battery life?
Rated battery life is 760 shots (CIPA) for the EOS R6 Mark II and 600 shots for the Alpha 7S III, giving the EOS R6 Mark II the edge.
How much does each cost?
EOS R6 Mark II launched at $2,499 and Alpha 7S III at $3,499. The EOS R6 Mark II is $1,000 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.