I fell for the hype and bought a Nikon D800. It was a nice camera, but, the 24-70mm G. Nikon's top of the line lens was a disaster. Even now, only a very few lenses can get the best of the D800, and, they are third party lenses, or prime lenses.
The big problem came with the lack of performance in extreme low light. It wasn't bad, just a little worse than the 5D MK III. Live View was another shortcoming, a poor implementation.
Since the big bucks is investments in lenses, I decided that paying more for less was not really the way to go.
I likely would never consider getting a nother high mp body unless it actually delivers enough more when coupled with a lens..