TL;DR
The Nikon D810 represents a professional upgrade to the D90 platform, providing a higher resolution and larger sensor format (FX).
- The camera features a high-resolution 36.3 million effective pixels and FX sensor format.
- While the overall layout is different, the camera has a highly detailed and vivid LCD screen, though the physical size is notably larger.
- The move to a high-resolution sensor results in a substantial increase in file size, requiring additional storage media.
- Performance enhancements include high-speed continuous shooting and support for 1080p video at multiple frame rates.