I know this is possibly not the perfect place to discuss this, but I've had such bad experience with cps and and sick of the focus issues with my 5d mark ii that I've seriously thought about switching to nikon.
I own 2 x 5D mark ii's, 16-35 2.8ii, 24-105, 70-200 2.8 ISii, 50 1.2 and 24 1.4...