Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Fujifilm - GFX 100 II | Sony - α7 IV |
|---|---|---|
| Weight | 1030 g | 658 g |
| Megapixels | 102 MP | 33 MP |
| AF points | 425 | 759 |
| Sensor size | Medium Format | Full Frame |
| Max video | 8K | 4K60 |
Between the GFX 100 II and α7 IV, the GFX 100 II comes out ahead in megapixels / sensor size, while the α7 IV wins on weight / af points. Overall, the GFX 100 II scores 81.7 and the α7 IV scores 70.4 on our Mars Score.
Which should you buy?
The GFX 100 II is the clear pick on raw spec strength, leading by 11.3 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.
Pick the GFX 100 II 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 — 209.09% more. 102 MP vs 33 MP.
Pick the α7 IV 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 — 372.00 g less. 658 vs 1030.
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 GFX 100 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: Fujifilm - GFX 100 II or Sony - α7 IV?
Fujifilm - GFX 100 II leads the current Mars Score by 11.3 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 Fujifilm - GFX 100 II if…
Fujifilm - GFX 100 II has the measurable edge on megapixels, sensor size, max video.
Choose Sony - α7 IV if…
Sony - α7 IV 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 Fujifilm - GFX 100 II wins
- ▲Megapixels — 209.09% more. 102 MP vs 33 MP.
- ▲Sensor size: Medium Format (vs Full Frame).
- ▲Max video: 8K (vs 4K60).
Why Sony - α7 IV wins
- ▲Weight — 372.00 g less. 658 vs 1030.
- ▲AF points — 78.59% more. 759 vs 425.
Spec comparison
Sensor
| Spec | Fujifilm - GFX 100 II | Sony - α7 IV |
|---|---|---|
| Sensor sizeⓘ | Medium Formatlead | Full Frame |
| Megapixels | 102 MPlead | 33 MP |
| Max ISO | 12800 | 51200lead |
Video
| Spec | Fujifilm - GFX 100 II | Sony - α7 IV |
|---|---|---|
| Max video | 8Klead | 4K60 |
| RAW video | truelead | false |
| Log profileⓘ | true | true |
Autofocus
| Spec | Fujifilm - GFX 100 II | Sony - α7 IV |
|---|---|---|
| AF pointsⓘ | 425 | 759lead |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Fujifilm - GFX 100 II | Sony - α7 IV |
|---|---|---|
| Weight | 1030 g | 658 glead |
| Weather sealedⓘ | true | true |
| Dual card slotsⓘ | true | true |