Hi,
After some simple check, seems like all in ok.
-no decentering
-no obvious FF/BF even in low tungsten light
I have limit my "infocus/sharpness" check to x11 view in playback, that helps.
-Kit lens have lower contrast and sharpness compared to canon kit lens, especially at 55mm (at least for my copy of both),
-Pentax jpeg have less tweaking done in camera by default, I have turn up jpeg contrast and sharpness so that it is more comparable to what come out of canon 550 (just for the sake of checking things are ok, in future, will do this in PP).
-SR noise in live view is quite annoying, SR seems less effective than in lens IS at times.
-high ISO noise is very good for K-5
Generally very happy with K-5. All my MF lens are now usable in low light (green button, SR, high ISO, bright and larger OVF etc).
Thanks to members that try to help.
-kk