The Pentax K-r is 4.5 mm narrower, 6 mm taller, 15 mm deeper and 153 g heavier than the Olympus E-420.
| Olympus E-420 | Pentax K-r | |
|---|---|---|
| Size (W × H × D) | 129.5 × 91 × 53 mm | 125 × 97 × 68 mm |
| Weight | 445 g | 598 g |
| Lens | Four Thirds | Pentax K |
| Sensor | Four Thirds | — |
| Announced | 2008 | 2010 |