Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Canon - EOS R1 | Canon - EOS R5 Mark II |
|---|---|---|
| Weight | 1115 g | 746 g |
| Megapixels | 24 MP | 45 MP |
| Max video | 6K | 8K |
Between the EOS R1 and EOS R5 Mark II, the EOS R1 comes out ahead in several specs, while the EOS R5 Mark II wins on weight / megapixels. Overall, the EOS R1 scores 73.5 and the EOS R5 Mark II scores 81.8 on our Mars Score.
Which should you buy?
The EOS R5 Mark II is the clear pick on raw spec strength, leading by 8.3 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.
The EOS R1 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the EOS R5 Mark II if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, megapixels, max video. The single most decisive one: Weight — 369.00 g less. 746 vs 1115.
Both ship with comparable sensor size, in-body stabilization, af points, so those specs do not separate the two — focus on the differences below.
Bottom line: the EOS R5 Mark II 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 Canon - EOS R5 Mark II?
Canon - EOS R5 Mark II leads the current Mars Score by 8.3 points.The more useful decision is the trade-off behind that result: compare megapixels, max video, weight against the way you will actually use the product.
Choose Canon - EOS R1 if…
Canon - EOS R1 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Canon - EOS R5 Mark II if…
Canon - EOS R5 Mark II has the measurable edge on weight g, megapixels, max video.
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
- No decisive advantages.
Why Canon - EOS R5 Mark II wins
- ▲Weight — 369.00 g less. 746 vs 1115.
- ▲Megapixels — 87.50% more. 45 MP vs 24 MP.
- ▲Max video: 8K (vs 6K).
Spec comparison
Sensor
| Spec | Canon - EOS R1 | Canon - EOS R5 Mark II |
|---|---|---|
| Sensor sizeⓘ | Full Frame | Full Frame |
| Megapixels | 24 MP | 45 MPlead |
| Max ISO | 204800lead | 102400 |
Video
| Spec | Canon - EOS R1 | Canon - EOS R5 Mark II |
|---|---|---|
| Max video | 6K | 8Klead |
| RAW video | true | true |
| Log profileⓘ | true | true |
Autofocus
| Spec | Canon - EOS R1 | Canon - EOS R5 Mark II |
|---|---|---|
| AF pointsⓘ | 1053 | 1053 |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Canon - EOS R1 | Canon - EOS R5 Mark II |
|---|---|---|
| Weight | 1115 g | 746 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |