Got my new K-x yesterday and wow what a camera, I can't see any noise at iso 100 and its sharp, sharp, sharp (with Tamron 17-50mm). My old Canon 450D had far more noise at low iso's and my E-P1 just doesn't compare when it comes down to pure image quality. I have found that turning SR off gives me far sharper images in good light, I will only use SR in dark situations which I suppose what its designed for. Well I'm happy now and very impressed so now I can stop moaning and just concentrate on shooting.
Interstingly the FocusCorr was set to -20 [um] when I checked the AF TEST in debug mode which I left alone.
Looking forward to building my Pentax kit and on the look out for a macro lens.
Thanks for everyones advice and comments.