I'm loyal to neither brand, whatever gets the job done is the best camera at the moment. That being said I'm here on CanonRumors because I own a lot of Canon gear, but If at any point I felt like Nikon offered me severe advantages over Canon, I would sell everything I own and switch over. The fact of the matter is these two companies will always leapfrog each other. Wannabe photogs sit around worrying about test scores, while real photogs are out creating beautiful images with whatever they can get their hands on. One of my mentors still shoots with a Canon 30D and Sigma lenses. He has shot some of the most iconic pictures in the world e.g. Miles Davis actually smiling, Stevie Wonder with his glasses off, James Brown just before he died and on and on.
My point being, the 5D Mark III is an excellent camera regardless of those silly tests and probably more than most wannabe photogs need, but they seem to want more and more from the camera to compensate for lack of visual imagination. Personally I was out shooting with my 5D Mark III while most people were still sitting around in forums reading about it. I had to because I make my living from shooting. If I don't shoot, I don't eat. I have found nothing that made me think "darn it I wish I had switched to Nikon".
Bottom line, test be damned, my 5D Mark III does exactly what it supposed to do and when the 1DX is released I'll get two of those too. I'll let other people worry about test scores, my rent is due.