Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Leica - SL3 | Sony - α1 II |
|---|---|---|
| Weight | 850 g | 743 g |
| Megapixels | 60 MP | 50 MP |
| AF points | 779 | 759 |
Between the SL3 and α1 II, the SL3 comes out ahead in megapixels / af points, while the α1 II wins on weight. Overall, the SL3 scores 80 and the α1 II scores 79.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (80 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 SL3 if you care most about megapixels / af points. The biggest gaps in its favor are megapixels, af points. The single most decisive one: Megapixels — 20.00% more. 60 MP vs 50 MP.
Pick the α1 II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight. The single most decisive one: Weight — 107.00 g less. 743 vs 850.
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: Leica - SL3 or Sony - α1 II?
Leica - SL3 leads the current Mars Score by 0.4 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 Leica - SL3 if…
Leica - SL3 has the measurable edge on megapixels, af points.
Choose Sony - α1 II if…
Sony - α1 II has the measurable edge on 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 Leica - SL3 wins
- ▲Megapixels — 20.00% more. 60 MP vs 50 MP.
- ▲AF points — 2.64% more. 779 vs 759.
Why Sony - α1 II wins
- ▲Weight — 107.00 g less. 743 vs 850.
Spec comparison
Sensor
| Spec | Leica - SL3 | Sony - α1 II |
|---|---|---|
| Sensor sizeⓘ | Full Frame | Full Frame |
| Megapixels | 60 MPlead | 50 MP |
| Max ISO | 100000 | 102400lead |
Video
| Spec | Leica - SL3 | Sony - α1 II |
|---|---|---|
| Max video | 8K | 8K |
| RAW video | true | true |
| Log profileⓘ | true | true |
Autofocus
| Spec | Leica - SL3 | Sony - α1 II |
|---|---|---|
| AF pointsⓘ | 779lead | 759 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Leica - SL3 | Sony - α1 II |
|---|---|---|
| Weight | 850 g | 743 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |