Originally posted by timoclan Live view does give a small improvement, it seems, but, as said, it's not a big problem and there's charm in having a bit t smoother images..
I used the 60-250 on both aps-c (K10D) and K-1. The image quality is superb, very sharp lens. If you are not getting it with the viewfinder you should do a AF Fine adjustment. As noted above you should adopt a scientific approach ..... one focussing attempt will probably not work.
How do you process the images you shoot ? Size; raw/jpeg; sharpening technique ?