Hmmmm.....I don't know what to think here, but I am thrilled with the accuracy and sharpness of my K5 compared to my previous Pentax cameras. I'm not a Pro or a pixel peeper, but Ilike what I get from the K5. As with any DSLR, when shooting Raw, which I prefer, processing is the key in getting the best from any shot.
I do have a friend that is a Pro, has a very successful business in North Dallas with some impressive clients, and I once asked him where he would be without post-processing, and his reply was "out of business".
Not saying you don't have a problem, but it is not clear that the problem is the K5?
I'll take shots like this all day.....not perfect, but plenty good enough for old Rupert!
Best Regards!