While reading this thread I felt like mentioning my 2 cents too.
I was on vacation with my wife and had the chance to try out the D800 and the 5D3 (again, this time production models),
and beside all the specs on paper and the new released DxO sensor test results I saw today, I (we) significantly prefered the 5D3.
It was just a better Allrounder, custom settings C1..., far better grip, faster setting changes, dial + touch dial, used high ISO very often, better placed ISO button, nicer-punchy color, better WB in artificial dim light conditions, better AF, far(!)better Displays, faster menu response, faster overall, very silent, quicker buffer cleaning, better pics on 27''screen (non scientific comparison
I could use the Canon for all our purposes (even Street, BIF or Church and similar.....), the Nikon only for Landscape and Wild but not moving.
So yes on paper the Nikon looked great, but when using...aaargh
for us taking fotos must be fun,
using(!) the Nikon was arkward while taking fotos and even more so in PP!
By the way, El Corte Ingles Palma de Mallorca had several Body D800, 5D3s and 5D3 Kits on stock, yet at very high prices (over list prices...).