Samsung D-XENON 12-24mm

Very sharp - a joy to use. Sturdy and well made. Fast enough for my use (landscape, documentary, travel) Negligible vignetting even with CPL (slim type). A bit more CA than expected/wanted. Overall - very good results on a Pentax K20d.

I love this lens, I love wide angle and until I got my 10-17 fisheye, this was my workhorse lense. It is solid and heavy, but nice to use. Pretty sharp and not much distortion unless you point it up at buildings etc. Pretty resistant to flare as well...