Between the OM-1 Mark II and α7C II, the OM-1 Mark II comes out ahead in af points, while the α7C II wins on weight and megapixels. Overall, the OM-1 Mark II scores 42.8 and the α7C II scores 52.8 on our Mars Score.
Which should you buy?
The α7C II is the clear pick on raw spec strength, leading by 10.0 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 OM-1 Mark II if you care most about af points. The biggest gaps in its favor are af points.
Pick the α7C II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, megapixels, sensor size.
Both ship with comparable max video, in-body stabilization, log profile, so those specs don't separate the two — focus on the differences below.
Bottom line: the α7C II is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why OM System - OM-1 Mark II wins
- ▲AF points — 38.74% more. 1053 vs 759.
Why Sony - α7C II wins
- ▲Weight — 85.00 g less. 514 vs 599.
- ▲Megapixels — 65.00% more. 33 MP vs 20 MP.
- ▲Sensor size: Full Frame (vs Four Thirds).
Spec comparison
Sensor
| Spec | OM System - OM-1 Mark II | Sony - α7C II |
|---|---|---|
| Sensor sizeⓘ | Four Thirds | Full Framelead |
| Megapixels | 20 MP | 33 MPlead |
| Max ISO | 102400lead | 51200 |
Video
| Spec | OM System - OM-1 Mark II | Sony - α7C II |
|---|---|---|
| Max video | 4K60 | 4K60 |
| RAW video | false | false |
| Log profileⓘ | true | true |
Autofocus
| Spec | OM System - OM-1 Mark II | Sony - α7C II |
|---|---|---|
| AF pointsⓘ | 1053lead | 759 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | OM System - OM-1 Mark II | Sony - α7C II |
|---|---|---|
| Weight | 599 g | 514 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | truelead | false |
Frequently asked
Spec-level deep dives
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