Nice shots! I love the lighting in that last one
I've certainly gone back and (re-)processed old photos, but I didn't really become photographically active in a big way until the K-5 was released.
However, in the last couple of years I've bought and used the Pentax *istDL, Samsung GX-1L (*ist DL2) and Samsung GX-10 (K10D) specifically because of their CCD sensors, and I've been blown away by the look of the files. It's not just down to colour mapping and tone curves in JPEGs... the sensors record light differently to the CMOS sensors in the K-5, K-3 and K-3II, so the RAW files are... well, different. The K-3II is the most capable Pentax camera that I own, with fantastic image quality - but the GX-10 / K10D produces better-looking photos in many situations...