During the last years Panasonic and Olympus achieved impressive results on the AF performance. As you know they rely on the contrast AF only. Canon, Nikon (and soon Sony too) are using a hybrid contrast and phase detection AF on their mirrorelss cameras like on the new Canon EOS-M. The video on top has been made by Dpreview to shows the comparison between the G5 AF and the 650D AF.
I think the real advantage of phase detetion is the continous AF on moving objects. On still objects the Panasonic easily beats the Canon!