Premier test de l'AF du 6D ici : LensRentals.com - A Quick 6D AF Test

Leur conclusion :
"The bottom line is the 6D AF is about identical to what we saw with the 5D II as far as center point accuracy. It may be worlds better in low light, or Servo mode, or with peripheral sensors. I can’t comment on that. And actually I didn’t find the 5DII center point AF bad at all.

But the 5D III, along with the 1Dx, are more accurate in this test."