i recently got the WR kit lens. After returning the first 2, ended up with an ok sample. First one wasn't very good optically, second one had a manual focus ring that felt like it had sand in it (probably the clutch mech. not releasing properly), plus at times ring wouldn't want to turn. It was also quite bad optically.
Third one works well and has tolerable image qualities at f7.1 to f11, between approx. 20mm to 50mm, that is, in that range foliage doesn't turn all to blobs.
i quite like the size and feel of the lens and the WR version has a better shape in my hand than the AL II.
Very glad i bought mine at a photo store that tolerated my fussiness and let me return the first 2 units. It's not much of a testament for the factory quality control.
The man at the service counter also tested my second return against an AL I lens from their Pentax display, and i noticed that that unit had a focusing geartrain that never released the autofocus, so when i turned the focus ring it spun the autofocus motor in the cam body.
Not being a Pentax expert the service counter guy thought that was normal until i pointed it out to him. He was otherwise extremely helpful.
Edit: i did test the WR against a friend's DA L version, and the WR has better contrast and rez. The DA L focus ring felt a mite better however.
Last edited by conradj; 09-17-2009 at 02:39 AM.