There are many things to like about the E-P1 but the CDAF just isn't up to Panasonic's which is a shame. Another trick Panasonic used (with some controversy) is the trick of having lens correction data in the RAW files so that when processed in LR the lens distortion and CA vanish. With lenses like the 17mm pancake one needs to correct the barrel distortion and CA using software not suited to the lens. However, I note that Olympuses own software does do the corrections so maybe when the others have official support they too will have the correction built in.