Hey PT, I got mine last Friday. New in box as advertised.
I have to say the sensor is stunning me. I didn't expect much of an improvement over the K20D/K-7 sensor in terms of detail, but it's definitely there, as well as the beefy DR boost and SNR; good times!
Some things I didn't expect:
The dust reduction system, which is supposed to be the same as the K-7, is two orders of magnitude quieter. I have to put my ear to the camera to hear it now.
The auto-rotate feature in playback mode doesn't work as well as it did on the K-7. It used to rotate the images appropriately as I turned the camera to portrait mode. Now it just stays fixed as if I'm viewing in landscape mode. Weird that Pentax had this right with the K-7 and messed it up on the K-5.
I seem to be experiencing uncorrectably bad front focusing from the phase-detect autofocus system, but it appears to be due to a combination of low/tungsten light. I thought Pentax fixed this with firmware updates (I updated to 1.13), but it appears not, and Falk's blog backs this up.
The SR system stays active much longer and locks quicker than the K-7, good job on this.
Overall I'm impressed. I'm not convinced yet that my AF issue is "normal" or needs CRIS to look at it, but since almost all of my shots are using manual focus and just the focusing screen, I'm not too worried about it. Plus, if it's just a low light tungsten issue, I can deal with that. Again, the sensor performance is eye opening to be sure. I'm happy with the purchase.
PS, I got fooled by the K-3 announcement as well. I do wish for a FF announcement, but I'm in no condition to drop $2.5k+ on a FF body right now. I'd give it a couple years to wait for a crazy deal like this one.