Yeah, you'd think it had gone through all the reviews in the world after reading the various threads here. It is well known that it is x and y with shades of P. Amazing. In this regard I was thinking more about the ability of the camera (1DMkIV) to drive the lens. I've heard here that the 1DMkIV would beat the socks off the 7DMkII. What color the socks are we don't know yet but by the end of the day we might.