Here is one site that does a comparison - Nikon D800 versus Canon 5D mark iii.
Conclusion he draws is that they are a tie and it depends on personal preference.
That's kind of the overall feeling I was getting about these 2 cameras.
Its like Astrophysics telescopes verus Talahashi. Either would be a fantastic camera.
http://www.expertphotography.com/can...-which-is-best
Greg.