The 1ds3 is a great camera as well, has a nice big VF, super solid. But it is a hog of a camera.
I compare the 5d2 to the D800, and I like the files from the Canon better. Yes, not as flexible in post, and they fall apart quickly, and the Nikon is better built, but with an the 50 1.2 and the 85 1.2, as well as the Zeiss lenses, they have a very nice feel to them. Certainly not CCD, but for skin tones, the 5d2 beats the Nikon. The Canon is up there with the Fuji x100 on color. Where the Nikon shines is DR and tonality, especially for B&W.
I agree about the 5d3 being too smooth. It is a little 1 series, except for the finder. I had one for a month. I had to decide if I was going to keep it or submit it as an expense and hand it over to the studio. I handed it in, with no regrets.
I think the 5d2 shoots a beautiful file. I tested a 5d3 and it was too smooth, too I dunno digital and though the focus can be challanged on the 2, it's a great buy, good camera, probably best deal in the Canon world.
IMO
BC