Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Canon - EOS R5 Mark II | Sony - α1 II |
|---|---|---|
| AF points | 1053 | 759 |
| Megapixels | 45 MP | 50 MP |
| Weight | 746 g | 743 g |
Between the EOS R5 Mark II and α1 II, the EOS R5 Mark II comes out ahead in af points, while the α1 II wins on megapixels / weight. Overall, the EOS R5 Mark II scores 81.8 and the α1 II scores 79.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (81.8 vs 79.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the EOS R5 Mark II if you care most about af points. The biggest gaps in its favor are af points. The single most decisive one: AF points — 38.74% more. 1053 vs 759.
Pick the α1 II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are megapixels, weight. The single most decisive one: Megapixels — 11.11% more. 50 MP vs 45 MP.
Both ship with comparable sensor size, max video, 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 R5 Mark II or Sony - α1 II?
Canon - EOS R5 Mark II leads the current Mars Score by 2.2 points.The more useful decision is the trade-off behind that result: compare megapixels, weight against the way you will actually use the product.
Choose Canon - EOS R5 Mark II if…
Canon - EOS R5 Mark II has the measurable edge on af points.
Choose Sony - α1 II if…
Sony - α1 II has the measurable edge on megapixels, weight g.
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 R5 Mark II wins
- ▲AF points — 38.74% more. 1053 vs 759.
Why Sony - α1 II wins
- ▲Megapixels — 11.11% more. 50 MP vs 45 MP.
- ▲Weight — 3.00 g less. 743 vs 746.
Spec comparison
Sensor
| Spec | Canon - EOS R5 Mark II | Sony - α1 II |
|---|---|---|
| Sensor sizeⓘ | Full Frame | Full Frame |
| Megapixels | 45 MP | 50 MPlead |
| Max ISO | 102400 | 102400 |
Video
| Spec | Canon - EOS R5 Mark II | Sony - α1 II |
|---|---|---|
| Max video | 8K | 8K |
| RAW video | true | true |
| Log profileⓘ | true | true |
Autofocus
| Spec | Canon - EOS R5 Mark II | Sony - α1 II |
|---|---|---|
| AF pointsⓘ | 1053lead | 759 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Canon - EOS R5 Mark II | Sony - α1 II |
|---|---|---|
| Weight | 746 g | 743 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |