DA15 is a great little lens. Its the one that always comes with me and usually is the first one on the camera.
The Sigma 8-16 intruiging for how crazy-wide it its. (10-20 was not as "interesting" to me sorry) I only picked up one in the marketplace a few weeks ago and had some fun with it. but there's no way it would displace the DA15.
I think I read somewhere that the K-5 II would support FL below 10mm in the exif data. (K-7, K-5, K-r, K-x doesn't)
I can find out in about a month.
Anyone confirm this?