The Olympus PEN E-PL1 is 16.4 mm narrower, 24.8 mm shorter, 31.5 mm thinner and 406 g lighter than the Pentax K-5.
| Pentax K-5 | Olympus PEN E-PL1 | |
|---|---|---|
| Size (W × H × D) | 131 × 97 × 73 mm | 114.6 × 72.2 × 41.5 mm |
| Weight | 740 g | 334 g |
| Lens | Pentax K | Micro Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2010 | 2010 |