The Olympus E-3 is 4.5 mm wider, 39 mm taller, 36.5 mm deeper and 280 g heavier than the Leica M7.
| Leica M7 | Olympus E-3 | |
|---|---|---|
| Size (W × H × D) | 138 × 77.5 × 38 mm | 142.5 × 116.5 × 74.5 mm |
| Weight | 610 g | 890 g |
| Lens | Leica M | Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2002 | 2007 |