Many of the lens reviews tend to comment on their autofocus performance, but they seem to be mostly subjective in nature (fast, slow, hunts around etc). I understand that the autofocus performance is also a function of the camera body being used (the number and type of AF points vary greatly), along with the lighting conditions. AF servo performance is another function that would be useful to quantify, particularly for action photography.
However, if we were to keep these factors (same camera body, standardized lighting) a constant, would it be possible to measure and quantify the autofocus performance of a lens?
Also, on this note, which influences the AF ability of a camera more - the lens or the body (say the Canon EF-S 18-55mm kit lens on a 7D vs the EF-S 17-55mm f/2.8 on a 600D)?