The Pentax K-3 III is 2 mm narrower, 6.5 mm shorter, 12 mm thinner and 190 g lighter than the Pentax K-1 Mark II.
| Pentax K-1 Mark II | Pentax K-3 III | |
|---|---|---|
| Size (W × H × D) | 136.5 × 110 × 85.5 mm | 134.5 × 103.5 × 73.5 mm |
| Weight | 1,010 g | 820 g |
| Lens | Pentax K | Pentax K |
| Announced | 2018 | 2021 |