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I quote from dpreview http://www.dpreview.com/previews/canon-eos-6d/6
"We've not spent enough time with the EOS 6D to fully get to grips with it yet, but there's little doubt that it looks like a highly-competent camera on paper. The addition of built-in Wi-Fi and GPS probably won't immediately grab traditionalists, but we can envisage all sorts of situations where they'll be useful, from geotagging your travel shots to remote-controlling your camera from your smartphone.
The elephant in the room, though, is the Nikon D600 - a camera that offers a higher spec in several key areas, with its 39-point AF system (including 9 cross-type), 100% viewfinder, 2016 pixel colour-sensitive metering, faster 5.5 fps shooting, dual card slots and excellent movie spec (including such things as clean HDMI output and a headphone socket for sound monitoring). In many areas the 6D just comes up slightly short in comparison, and the question is whether merely being highly competent will be enough to win the hearts and cash of buyers."