The OM System OM-3 is 10.4 mm wider, 8 mm shorter, 35 mm thinner and 241 g lighter than the Sony Alpha 1.
| Sony Alpha 1 | OM System OM-3 | |
|---|---|---|
| Size (W × H × D) | 128.9 × 96.9 × 80.8 mm | 139.3 × 88.9 × 45.8 mm |
| Weight | 737 g | 496 g |
| Lens | Sony E | Micro Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2021 | 2025 |