To me, the price of the body is only a part of the total equation.
If you're serious enough to be wanting a good FF camera, you also want lenses, flashes and all sorts of other accessories to get those shots and a camera that makes it easy to get them.
To me, while Nikon make some very good cameras, their lenses are just too expensive for me and they don't seem to offer much more than Canon do for the focal lengths I use.
I made the decision to go with Canon after dallying with Nikon, some time ago and I find this berating of the 5D3 against the D800 rather childish.
I bet that in a year or 2, when you are salivating over these gorgeous landscapes taken by top photographers, and the fantastic studio shots in magazines etc., that the majority of them will be taken using Canon cameras, and not Nikon, just as they are now.
Most true pros don't pixel peep like many of us amateurs. They're too busy taking GOOD photos to worry about it.
It's a bit like boasting that your car can do 0-60mph 1/10th of a second quicker than another car, and so your car MUST be a better car. But you never mention how dreadfull it is going around corners or the poor build quality and poor re-sale value.
It's really just a childish attitude.