The 5d2 can't track...
The only lens I'm using now is the Zeiss 28mm to have any hope of getting any images in proper focus.
Calibrated lenses, but that's only for outside use. The 5d2 is so bad in lower indoor light with AF is not even funny. People keep saying the center point of the 5d is one of the best Canon has ever made, which is completely untrue. Outdoors the 5d is fantastic camera, IQ is waay above the mk4 in every term (at least under 1600 iso), but AF is limited to ONE point, and that doesn't work either in lower light. I have 1 meter frontfocus, even with one shot indoors. And the lenses work perfect outside.
People may argue with my post, but unless you have tried with these three lenses wide open, 24 L II, 50 L and 85 L II, don't bother. at 2,8 I'm sure the 5d is working okay to some extent, but not with larger apertures. The mk4 demolished it no matter what people may claim for center point abilities.
I'm waiting sooooo much for the 1d X to finally GET HERE!