Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Leica - SL3 | OM System - OM-1 Mark II |
|---|---|---|
| Weight | 850 g | 599 g |
| Megapixels | 60 MP | 20 MP |
| AF points | 779 | 1053 |
| Sensor size | Full Frame | Four Thirds |
| Max video | 8K | 4K60 |
Between the SL3 and OM-1 Mark II, the SL3 comes out ahead in megapixels / sensor size, while the OM-1 Mark II wins on weight / af points. Overall, the SL3 scores 80 and the OM-1 Mark II scores 67.4 on our Mars Score.
Which should you buy?
The SL3 is the clear pick on raw spec strength, leading by 12.6 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the SL3 if you care most about megapixels / sensor size. The biggest gaps in its favor are megapixels, sensor size, max video. The single most decisive one: Megapixels — 200.00% more. 60 MP vs 20 MP.
Pick the OM-1 Mark II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, af points. The single most decisive one: Weight — 251.00 g less. 599 vs 850.
Both ship with comparable in-body stabilization, log profile, so those specs do not separate the two — focus on the differences below.
Bottom line: the SL3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Leica - SL3 or OM System - OM-1 Mark II?
Leica - SL3 leads the current Mars Score by 12.6 points.The more useful decision is the trade-off behind that result: compare megapixels, sensor size, max video, weight against the way you will actually use the product.
Choose Leica - SL3 if…
Leica - SL3 has the measurable edge on megapixels, sensor size, max video.
Choose OM System - OM-1 Mark II if…
OM System - OM-1 Mark II has the measurable edge on weight g, af points.
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 — 200.00% more. 60 MP vs 20 MP.
- ▲Sensor size: Full Frame (vs Four Thirds).
- ▲Max video: 8K (vs 4K60).
Why OM System - OM-1 Mark II wins
- ▲Weight — 251.00 g less. 599 vs 850.
- ▲AF points — 35.17% more. 1053 vs 779.
Spec comparison
Sensor
| Spec | Leica - SL3 | OM System - OM-1 Mark II |
|---|---|---|
| Sensor sizeⓘ | Full Framelead | Four Thirds |
| Megapixels | 60 MPlead | 20 MP |
| Max ISO | 100000 | 102400lead |
Video
| Spec | Leica - SL3 | OM System - OM-1 Mark II |
|---|---|---|
| Max video | 8Klead | 4K60 |
| RAW video | truelead | false |
| Log profileⓘ | true | true |
Autofocus
| Spec | Leica - SL3 | OM System - OM-1 Mark II |
|---|---|---|
| AF pointsⓘ | 779 | 1053lead |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Leica - SL3 | OM System - OM-1 Mark II |
|---|---|---|
| Weight | 850 g | 599 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |