The Sigma SD1 is 15.5 mm wider, 19.5 mm taller, 20 mm deeper and 229 g heavier than the Olympus E-620.
| Olympus E-620 | Sigma SD1 | |
|---|---|---|
| Size (W × H × D) | 130 × 94 × 60 mm | 145.5 × 113.5 × 80 mm |
| Weight | 521 g | 750 g |
| Lens | Four Thirds | Sigma SA |
| Sensor | Four Thirds | — |
| Announced | 2009 | 2010 |