So i´m in the market for a full frame camera right now. I only have FF lenses for EF mount, so switching would at least mean the loss of a lens or two (money reasons).
Right now canon is far behind others. Or lets just say it: Nikon.
The d800 is 2300€ the 5d3 is 2900€ and the Nikon just is the superior camera. If you downsize the image even high iso is awesome, af is good etc. It´s just a really good body and much more in the price range of a 6d.
I want to stick with canon but if they are going to make their first competitive body in like 5 years i really have to consider switching....
Back to the old days when people compared Canon 5D II and Nikon D700, many folks in this forum would say center AF is their shooting style, high ISO is not a big deal, video is a must, etc.
Now the focus for this discussion in this forum is shifted to lenses even though Canon have not released many new ones in the past few years.
Anyway, either brands have their pros and cons and have their own fanboys, but it is centainly not a good forum for this discussion. Try dbreview or others if you are serious about getting some real comments. By the way, this is a great place for getting new product info and techniques of Canon cameras.