The D800 would offer two advantages:

- For birds and such, it has much better AF than the D7000. The D7000 AF is pretty good, but I often encounter it's limitations, especially when shooting birds in flight. The initial acquisition time and the tracking abilities are not on par with my D700. The D800 combines the pixel density of the D7000 with the AF of pro bodies (it's even better than the D700).

- For landscapes, you will get better resolution. Since both D7000 and D800 have the same pixel density, you can think about it as if it were film cameras: a 35mm film camera and an APS film camera, both loaded with the same film. Once you take your shots and get the slides back, the side from the 35mm camera is twice the size as the slide from the APS camera. So you can make bigger prints from it, or prints are the same size will look crisper.

Tom
Bay Area Nikonian

http://www.tkphoto.me/