I'm curious how off were they?I have been running with FW2.1 since it became available. In my estimation the performance increase in C-AF is significant. I don't have hard numbers but I would say that the number of keepers where I can actually keep the single focus point on target is nearing 100%. Most if not all shots that are out of focus are completely my fault. I am shooting with the Oly 12-100 and Pany 100-400 (both C-AF calibrated) most of the time now so YMMV.