Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Canon - EOS R1 | OM System - OM-1 Mark II |
|---|---|---|
| Weight | 1115 g | 599 g |
| Megapixels | 24 MP | 20 MP |
| Sensor size | Full Frame | Four Thirds |
| Max video | 6K | 4K60 |
Between the EOS R1 and OM-1 Mark II, the EOS R1 comes out ahead in megapixels / sensor size, while the OM-1 Mark II wins on weight. Overall, the EOS R1 scores 73.5 and the OM-1 Mark II scores 67.4 on our Mars Score.
Which should you buy?
The EOS R1 edges ahead on the Mars Score (73.5 vs 67.4), but the 6.1-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the EOS R1 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 — 20.00% more. 24 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. The single most decisive one: Weight — 516.00 g less. 599 vs 1115.
Both ship with comparable in-body stabilization, af points, log profile, so those specs do not separate the two — focus on the differences below.
Bottom line: the EOS R1 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: Canon - EOS R1 or OM System - OM-1 Mark II?
Canon - EOS R1 leads the current Mars Score by 6.1 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 Canon - EOS R1 if…
Canon - EOS R1 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.
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 R1 wins
- ▲Megapixels — 20.00% more. 24 MP vs 20 MP.
- ▲Sensor size: Full Frame (vs Four Thirds).
- ▲Max video: 6K (vs 4K60).
Why OM System - OM-1 Mark II wins
- ▲Weight — 516.00 g less. 599 vs 1115.
Spec comparison
Sensor
| Spec | Canon - EOS R1 | OM System - OM-1 Mark II |
|---|---|---|
| Sensor sizeⓘ | Full Framelead | Four Thirds |
| Megapixels | 24 MPlead | 20 MP |
| Max ISO | 204800lead | 102400 |
Video
| Spec | Canon - EOS R1 | OM System - OM-1 Mark II |
|---|---|---|
| Max video | 6Klead | 4K60 |
| RAW video | truelead | false |
| Log profileⓘ | true | true |
Autofocus
| Spec | Canon - EOS R1 | OM System - OM-1 Mark II |
|---|---|---|
| AF pointsⓘ | 1053 | 1053 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Canon - EOS R1 | OM System - OM-1 Mark II |
|---|---|---|
| Weight | 1115 g | 599 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |