Originally posted by Croc i was able to reproduce the problem with more than just one K5 so it does raise a question about pentax AF with fast lenses (when wide open) and not just my camera only.
and as pointed out in regards to thread with sharp pictures, most people seem to think that if it is sharp at f11 then there is no problem with AF at all so saying that majority doesn't have this issue is nothing more but guess right now.
No, you are incorrect and your logic is flawed.
Don't confuse sharpness and focus accuracy. The "soft" K-5 issue wasn't about AF accuracy. While poor AF accuracy can also produce a soft image, the softness issue was about whether or not the K-5 could produce very sharp images (perhaps because of the AA filter) in comparison to previous Pentax bodies and other bodies that used the K-5 sensor but a different AA filter (Nikon D7000). Testing at small apertures such as f/11 makes sense in that application.
When I, and others, test the K-5 for focus accuracy, it is done with fast lenses shot wide open. I mainly used my 31/1.8, 55/1.4 and 85/1.4 to conduct these tests. Post v1.03, the only focus shift I see in in extremely low light (around 1EV or less), and as far as I am concerned the K-5 AF is working fine.
I am sorry you are having issues and I do understand that it can be frustrating. Clearly this thread hasn't gone in a very positive direction, and I imagine that is adding to your frustration as well.