Just hopping into this thread to say that I just purchased a used K-5 with circa 6,000 shutter count and a
Sigma 17-70mm. I only recently upgraded my (admittedly outdated) Olympus E-PM1 to a Panasonic G80, but I grabbed the K-5 at a good price. I'm thinking that I'll continue using my G80 as the camera I carry on a daily basis and that I'll make especial use of the K-5 when I want to focus on landscapes or more complex compositions that would benefit from a higher dynamic range than my micro-4/3 sensor could provide!
I have habitually used film-era Pentax lenses via an adapter on my Oly and Panny cameras, but I am excited to pop them onto my K-5 now and have a go.
I haven't had a lot of time to play with the K-5 just yet (it arrived yesterday), but I'm thinking that these forums will be a great resource as I get going with this camera!