The Pentax K-3 III is 0.3 mm narrower, 11.9 mm taller, 0.8 mm deeper and 221 g heavier than the Olympus OM-1.
| Olympus OM-1 | Pentax K-3 III | |
|---|---|---|
| Size (W × H × D) | 134.8 × 91.6 × 72.7 mm | 134.5 × 103.5 × 73.5 mm |
| Weight | 599 g | 820 g |
| Lens | Micro Four Thirds | Pentax K |
| Sensor | Four Thirds | — |
| Announced | 2022 | 2021 |