The Pentax 645D is 33.7 mm wider, 48.1 mm taller, 81.8 mm deeper and 1,060 g heavier than the Olympus PEN E-P5.
| Olympus PEN E-P5 | Pentax 645D | |
|---|---|---|
| Size (W × H × D) | 122.3 × 68.9 × 37.2 mm | 156 × 117 × 119 mm |
| Weight | 420 g | 1,480 g |
| Lens | Micro Four Thirds | — |
| Sensor | Four Thirds | — |
| Announced | 2013 | 2010 |