The Nikon D810 is 11.9 mm wider, 32.1 mm taller, 12.6 mm deeper and 400 g heavier than the Olympus OM-D E-M1 Mark III.
| Olympus OM-D E-M1 Mark III | Nikon D810 | |
|---|---|---|
| Size (W × H × D) | 134.1 × 90.9 × 68.9 mm | 146 × 123 × 81.5 mm |
| Weight | 580 g | 980 g |
| Lens | Micro Four Thirds | Nikon F |
| Sensor | Four Thirds | — |
| Announced | 2020 | 2014 |