Thanks for the replies guys. I know the K-7 and K-5 are supposed to use the same system (as opposed to the K-r), but perhaps the "ultrasonic" part of the K-7 had some resonance with internal elements to make it more "sonic".
I expect the lens release button won't stay on for long. I'll keep an eye on it and hopefully when it falls off I won't lose it.
As for front focusing, I think you guys misunderstood me. The diopter and viewfinder accuracy is perfect. What I see is what I get from the viewfinder. The problem is the focus confirmation mechanism (green hex) isn't in line with this reality. For example, if I put the camera in "catch-in-focus" mode and spun the focus ring (in either direction mind you), the shot will be taken with significant front focus. It's as if the phase detection algorithm parameters needs a little tweaking.