reviews and compares the Nikon D810 to the Nikon D800, Canon 5D Mark III and Sony FS700:
The D800 was an incredible jump in technology for it’s time. The D700 was 12MP and the D800 jumped to 36MP without losing the incredible ISO performance. The D800 never really had any major downfalls and therefore it has become very difficult to even imagine a camera much better than the D800. The D810 is not a completely new camera; it’s an upgrade and some how they have managed to upgrade almost every major feature of the camera. The question is, are these upgrades worth selling your current D800 (for the current used price of $1800) and paying $1500 more for a D810? I’ll tell you about my findings and you can make that decision for yourself.
Read additional thoughts and review here on his blog.