I don't believe there is any camera out there whose AF system is 100% accurate. There's always a shot here and there where for some odd reason the camera did not focus properly. A lot has to do with how the AF is setup. I personally hate the multi-point setting on any camera because I never know what the camera will choose to focus on. I've had the A300 and A200 and IMO, they both have a pretty decent AF system. Much much better than the Oly E520 I had.