I currently own a 5D2 and despise the AF Servo system. I owned 2 1D bodies in the past and wish I would have never sold them.
I now have the 1DX on order but it looks like the camera will not be ready for a 3 week Europe trek we have planned for the first of June. I don't mind picking up a 5D3 in the meantime as I have read that camera has the same AF system. I would like to know if the AF servo is as fast though as what I had in a 1 series body.