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
Released Nov 2025
Sony
Alpha 7R III
42MP workhorse for landscape and studio before the A7R IV/V era.
$3,199
Released Oct 2017
EOS R6 Mark III is 8 years newer.
Wins
EOS R6 Mark III
Wins
Alpha 7R III
3 categories tied
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TL;DR — Key differences
- AEOS R6 Mark III has higher Max video bit rate (2600 Mbps vs 150 Mbps)
- AEOS R6 Mark III has higher Burst (electronic) (40 fps vs 10 fps)
- AEOS R6 Mark III has higher 4K max frame rate (120 fps vs 30 fps)
- AEOS R6 Mark III has higher AF points / zones (1053 vs 399)
- AEOS R6 Mark III has higher ISO max (native) (64,000 vs 32,000)
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 7R III
127 × 96 × 74 mm
657 g (1.45 lb / 23.18 oz)
EOS R6 Mark III is 12mm wider, 3mm taller, and 15mm thicker than Alpha 7R III.
EOS R6 Mark III is 42 g heavier than Alpha 7R III.
Depth (front-to-back): 88mm EOS R6 Mark III · 74mm Alpha 7R III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark III
138 × 98 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 R6 Mark III
138 × 88 mm
Alpha 7R III
127 × 74 mm
Sensor size, to scale
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7R III
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
EOS R6 Mark III
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 R6 Mark III
AF low-light limit
-6.5 EV vs -3 EV — lower is better
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 150 Mbps — higher is better
Codecs
Adds CRM, 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
AF points / zones
1053 vs 399 — 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
Codecs
Adds XAVC S, AVCHD
Card types
Adds SD UHS-I
Resolution
42.4 MP vs 32.5 MP — higher is better
Weight
657 g vs 699 g — lower is better
EVF magnification
0.78 × vs 0.76 × — higher is better
Battery life (CIPA)
650 shots vs 640 shots — higher 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 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 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 R6 Mark III or Alpha 7R III?
EOS R6 Mark III 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 R6 Mark III and Alpha 7R III?
EOS R6 Mark III is 32.5 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 R6 Mark III and Alpha 7R III have in-body image stabilization?
EOS R6 Mark III 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 R6 Mark III or the Alpha 7R III?
EOS R6 Mark III reaches 40 fps electronic. Alpha 7R III reaches 10 fps electronic.
What's the weight difference between the EOS R6 Mark III and Alpha 7R III?
EOS R6 Mark III weighs 699 g and Alpha 7R III weighs 657 g, so the Alpha 7R III is 42 g lighter.
Do the EOS R6 Mark III and Alpha 7R III record 4K video?
EOS R6 Mark III: 4K up to 120p. Alpha 7R III: 4K up to 30p.
Are the EOS R6 Mark III and Alpha 7R III weather sealed?
EOS R6 Mark III: Yes. Alpha 7R III: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS R6 Mark III and 650 shots for the Alpha 7R III, giving the Alpha 7R III the edge.
How much does each cost?
EOS R6 Mark III launched at $2,799 and Alpha 7R III at $3,199. The EOS R6 Mark III is $400 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.