Was searching the web when I came across this contribution from someone who did a timelapse of the Milkyway galaxy in Mersing using a Pentax K5. He was obviously inspired by another fellow time-lapse photographer from his choice of BGM but it show how capable the Pentax K5 can be. Imagine what you can do with a newer sensor in the K5-II and K5s!
Pentax K5: Milkyway Timelapse 2012 - YouTube
Related info : Our local astro group Singastro (singastro.org) organises regular trips to Mersing for astronomy sessions. I suspect this chap was one of those who went for a trip last year. The next trip would be in mid-Mar 2013