The Pentax K-S1 is 2.3 mm narrower, 23.6 mm taller, 32.3 mm deeper and 138 g heavier than the Olympus PEN E-P5.
| Olympus PEN E-P5 | Pentax K-S1 | |
|---|---|---|
| Size (W × H × D) | 122.3 × 68.9 × 37.2 mm | 120 × 92.5 × 69.5 mm |
| Weight | 420 g | 558 g |
| Lens | Micro Four Thirds | Pentax K |
| Sensor | Four Thirds | — |
| Announced | 2013 | 2014 |