There's not a lot of point in me doing lots of comparison tests with the camera, as they have all been done before. Its pretty well documented just how good the results are, and I'm going to concentrate on what its like to use this camera. However I felt it important to state just how good I think it is in terms of image quality.
Like the D7000 before it, the overiding impression I get from this camera is, apart from the size and weight, I completely forget about it. Its one of those cameras that lets me concentrate totally on the process of creating pictures. Though I can use my polaroid sunglasses with the optical viewfinder, the screen is affected by the polarising effect, and I have to take them off to see what I've taken. However after two days, I've basically stopped looking. The exposures are dead on virtually every time, plus the latitude in the files is such that any under or over exposure is easily taken care of in photoshop. The AF is sure and fast, and having used Nikons on and off since 1990, I seem to know instinctively where all the controls are.
I really enjoyed using the camera yesterday, my back less so!! Maybe I'll have a go at body building classes!! My way of dealing with this is going to be to keep what I take out with the D800 relatively light. Yesterday I carried my 35mm f/2D lens only. Its a great lens, and one that I ended up using on my D3X virtually exclusively, and the results were really very special. Indeed the D800 is a very special camera and I can't wait to get out and use it again.