Canon 6D vs Nikon D600 ?
If you're considering the Nikon D600, don't bother. The 6D is superior for its far better ergonomics. I own both of these, and the 6D is much more fun, smooth and easy to shoot, while the D600 is a pain, and the D600's colors often have a green/magenta shift problem. The D600 is the best camera made by Nikon, but nowhere near as good in actual shooting as the 6D.
Good to hear that as a canon owner.
Merry Christmas to all. God Bless.