The Olympus PEN E-PL1 is 16.9 mm narrower, 27.8 mm shorter, 36 mm thinner and 466 g lighter than the Pentax K-3.
| Pentax K-3 | Olympus PEN E-PL1 | |
|---|---|---|
| Size (W × H × D) | 131.5 × 100 × 77.5 mm | 114.6 × 72.2 × 41.5 mm |
| Weight | 800 g | 334 g |
| Lens | Pentax K | Micro Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2013 | 2010 |