I am returning it although the reason might be silly to some.
I have been flirting with transitioning to Nikon for a little over a year. The Sony sensors and their ability to lift shadows and the high dynamic range at base ISO's has been very tempting. Today I gave in and picked up a D800 and a Nikkor lens to test with. The results:
Love the ability to lift shadows with minimal increase in noise
Really like the cropping ability from the 36 megapixel sensor. I shoot a good bit of birds so lenses are never long enough (without breaking the bank).
High ISO noise control is very good. Very close to the 5DIII.
4 FPS is pretty anemic. I could live with that if they would have allowed 8FPS in DX mode. 6FPS is okay if that would have netted me the full frame image like the 5D3.
Ultimately, I am returning it because of the pain it inflicted upon me. I do not have large hands but man the ergonomics really suck. Maybe I am just use to canon but after shooting 45 minutes my hand is in some serious pain. It is a fine camera and the ergonomics I'm sure are fine for many. As a hobbyist, I need a body I will want to pick up and use and I'm afraid I would have avoided the D800. I couldn't justify sinking that much change into a body I would have hated to use. Therefore, I'm sticking with the 5D3 and the 1D4.

:o

