Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Fujifilm - X100VI | Sony - α9 III |
|---|---|---|
| Weight | 521 g | 703 g |
| AF points | 425 | 759 |
| Megapixels | 40 MP | 24 MP |
| Max video | 6K | 4K120 |
| Sensor size | APS-C | Full Frame |
Between the X100VI and α9 III, the X100VI comes out ahead in weight / megapixels, while the α9 III wins on af points / sensor size. Overall, the X100VI scores 72.3 and the α9 III scores 71.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (72.3 vs 71.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the X100VI if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight, megapixels, max video. The single most decisive one: Weight — 182.00 g less. 521 vs 703.
Pick the α9 III if you care most about af points / sensor size. Its strongest claims are af points, sensor size. The single most decisive one: AF points — 78.59% more. 759 vs 425.
Both ship with comparable in-body stabilization, log profile, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Fujifilm - X100VI or Sony - α9 III?
Fujifilm - X100VI leads the current Mars Score by 0.6 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 Fujifilm - X100VI if…
Fujifilm - X100VI has the measurable edge on weight g, megapixels, max video.
Choose Sony - α9 III if…
Sony - α9 III has the measurable edge on af points, sensor size.
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 - X100VI wins
- ▲Weight — 182.00 g less. 521 vs 703.
- ▲Megapixels — 66.67% more. 40 MP vs 24 MP.
- ▲Max video: 6K (vs 4K120).
Why Sony - α9 III wins
- ▲AF points — 78.59% more. 759 vs 425.
- ▲Sensor size: Full Frame (vs APS-C).
Spec comparison
Sensor
| Spec | Fujifilm - X100VI | Sony - α9 III |
|---|---|---|
| Sensor sizeⓘ | APS-C | Full Framelead |
| Megapixels | 40 MPlead | 24 MP |
| Max ISO | 12800 | 51200lead |
Video
| Spec | Fujifilm - X100VI | Sony - α9 III |
|---|---|---|
| Max video | 6Klead | 4K120 |
| RAW video | false | truelead |
| Log profileⓘ | true | true |
Autofocus
| Spec | Fujifilm - X100VI | Sony - α9 III |
|---|---|---|
| AF pointsⓘ | 425 | 759lead |
| Eye AFⓘ | true | true |
| In-body stabilizationⓘ | true | true |
Body & Controls
| Spec | Fujifilm - X100VI | Sony - α9 III |
|---|---|---|
| Weight | 521 glead | 703 g |
| Weather sealedⓘ | false | truelead |
| Dual card slotsⓘ | false | truelead |