I'm still standing by a few points that I've said earlier in other threads:
1.) The D800 seems to be a great "all-rounder" camera, but I must admit that 5DIII with the improved AF-system comes much closer to being one too.
2.) I still think that D800 owners will have to adapt a medium format "workflow" to get the best results from it. Hand-holding is going to be tricky one here, at least to get sharp images at 1:1.