I sold my D300S and committed to the D800 to avoid carrying two camera bodies when I am out with potential for wildlife and/or landscape photos. Also, I have missed some great photo opportunities when wildlife suddenly appeared, which they tend to do, but too close for my DX / telephoto combo in hand.
My thoughts thus far with regard to bird photography...I like the D800 better for including more environment given the same lens and distance to subject. However, I am not convinced about the detail in bird feathers when I get in tight. For me, I have not consistently matched the lovely detail in bird feathers that I could routinely expect with my D300S.
For now, I am still working on making the D800 my camera body of choice for birds, but the jury is still out in my mind.
I would like to hear more from those using the D800(E) for birds. How pleased are folks with the photos they are capturing and particularly what about the feather detail on tight photos. Sans all the discussion about potential for rare occurrences of moire. What about the 99.9% of the photos that don't have it? How pleased are folks with this camera for wildlife, particularly birds?