I've been having FF issues with my K-r since I bought it a few months ago and like the rest of you have been waiting for a K-5 like fix. I have kept my K10D as a manual lens shooter and use the K-r for AF but today I though I'd run some basic tests with MF lenses on the K-r as I had a few inconsistencies in the past. All the photos were focusing on the largest font, indoors with no ambient light. I'll run the same type of tests tomorrow outdoors.
Jupiter 9 (85mm) @ f/2 - live view
Jupiter 9 (85mm) @ f/2 - viewfinder
Super Takumar 55mm @ f/1.8 - live view
Super Takumar 55mm @ f/1.8 - viewfinder
Super Multi Coated Takumar 28mm @ f/3.5 - live view
Super Multi Coated Takumar 28mm @ f/3.5 - viewfinder
Helios 44M (58mm) @ f/2 - live view
Helios 44M (58mm) @ f/2 - viewfinder
From the evidence here, all photos taken with live view are much sharper than taken from the viewfinder and I'm not sure why. If anyone else has had issues like this, looking forward to hearing from you.