The biggest development in the AF system of the EOS 6D, is the increased sensitivity for low light focusing. The Canon EOS-1D X and EOS 5D Mark III full-frame DSLRs are able to focus in EV -2, which is the equivalent of shooting by the light of a full moon. However, by using the central cross-type AF point, the EOS 6D is able to focus in EV -3; that is 1-stop less light than is projected by a full moon.
That’s new to me. If you don’t shoot a lot of movies (that’s also me), this camera offers much more than the $2000 price tag carries.