The Olympus PEN E-PM2 is 35.7 mm narrower, 49.3 mm shorter, 46.2 mm thinner and 481 g lighter than the Sigma SD1.
| Sigma SD1 | Olympus PEN E-PM2 | |
|---|---|---|
| Size (W × H × D) | 145.5 × 113.5 × 80 mm | 109.8 × 64.2 × 33.8 mm |
| Weight | 750 g | 269 g |
| Lens | Sigma SA | Micro Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2010 | 2012 |