I currently own two 1D X's, with a third one coming, and two D800's. Nobody is going to reign supreme anytime soon. Both these cameras are wonderful, each is just a different tool. I now shoot almost all my residential and commercial architecture with the 800, most anything that moves, with the X bodies. The X has considerably less noise at iso's from 400 up when compared to the Nikon. The Nikon's dynamic range and megapixel count make it an exceptional tool for certain assignments.
I've solved the fanboy thing by having two rolling LowePro cases, one filled with Canon, one filled with Nikon. These are tools, great tools, but nothing more than that. As they say, "I ain't married to any of it!"