Originally posted by bdery I quite enjoyed my time with that lens. At the time, it competed with the Sigma 17-70 which offered close focusing, a faster wide angle, and a lower price. There was nothing wrong per se with the Pentax version.
I've owned 3 used copies
The first 2 had significant decentering issues and absolutely ghastly fare when the sun was in/near the frame. The one I currently own is very good optically, flare -while there - isn't as bad as on the previous copies, occasionally the AF gets weird near 70mm and @ 17mm when shooting at infinity. Fortunately I have yet to experience any SDM issues.
I think sometimes the positive aspects of the lens - sharp, nice color & contrast, cut-out in the hood for filters - get a bit lost when the subject of standard zooms comes up, and of course now it's overshadowed by its younger sibling 16-85.
Basically, I just feel good shooting with it.