Interesting post. I have 3 Pentax cameras and have just taken images of our highly decorated Christmas tree with a K-05 and a K-01. Want to try shots with both my 1st D and DP2X too.
With all settings at default I was surprised how much better the K-01 handles reds than the K-5.
Will try the other cameras over the weekend and advise. I have a number of limtied primes that are used with the K-01 and am really amazed at the quality that I get from this much maligned camera.