I continue to be dissappointed with the K5 AF when shooting using the viewfinder rather than the Live View method.
I realize that there is nothing that can be done to make the two methods of AF equal... (accurate) at this point. I don't think a firmware update will help.
Live View often results in more accurate AF than using the viewfinder and that is what bothers me the most. I bought the K5 because I am not a big fan of using the LCD for composition and focus but with the K5 it seems that the most accurate focus is achieved with Live View... in partiuclar when shooting wide open.. and I do that a lot.
I hope that the two methods of AF can eventually become equal in their performance. I love everything else about the K5 but the AF continues to bother me. I certainly have not reached the tipping point but I sure hate it when the AF is not spot on when not using Live View.
I had a frustrating weekend using the K5 and consider this nothing more than a Monday morning vent.