Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Canon - EOS R6 Mark II | Sony - α9 III |
|---|---|---|
| AF points | 1053 | 759 |
| Weight | 670 g | 703 g |
| Max video | 4K60 | 4K120 |
Between the EOS R6 Mark II and α9 III, the EOS R6 Mark II comes out ahead in af points / weight, while the α9 III wins on max video. Overall, the EOS R6 Mark II scores 72.1 and the α9 III scores 71.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (72.1 vs 71.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the EOS R6 Mark II if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are af points, weight. The single most decisive one: AF points — 38.74% more. 1053 vs 759.
Pick the α9 III if you care most about max video. Its strongest claims are max video. The single most decisive one: Max video: 4K120 (vs 4K60).
Both ship with comparable sensor size, megapixels, in-body stabilization, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Canon - EOS R6 Mark II or Sony - α9 III?
Canon - EOS R6 Mark II leads the current Mars Score by 0.4 points.The more useful decision is the trade-off behind that result: compare max video, weight against the way you will actually use the product.
Choose Canon - EOS R6 Mark II if…
Canon - EOS R6 Mark II has the measurable edge on af points, weight g.
Choose Sony - α9 III if…
Sony - α9 III has the measurable edge on max video.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Canon - EOS R6 Mark II wins
- ▲AF points — 38.74% more. 1053 vs 759.
- ▲Weight — 33.00 g less. 670 vs 703.
Why Sony - α9 III wins
- ▲Max video: 4K120 (vs 4K60).
Spec comparison
Sensor
| Spec | Canon - EOS R6 Mark II | Sony - α9 III |
|---|---|---|
| Sensor sizeⓘ | Full Frame | Full Frame |
| Megapixels | 24 MP | 24 MP |
| Max ISO | 102400lead | 51200 |
Video
| Spec | Canon - EOS R6 Mark II | Sony - α9 III |
|---|---|---|
| Max video | 4K60 | 4K120lead |
| RAW video | false | truelead |
| Log profileⓘ | true | true |
Autofocus
| Spec | Canon - EOS R6 Mark II | Sony - α9 III |
|---|---|---|
| AF pointsⓘ | 1053lead | 759 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Canon - EOS R6 Mark II | Sony - α9 III |
|---|---|---|
| Weight | 670 glead | 703 g |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |