I am using a K10D and I am very happy with it. The body performs really well. The user interface is in my opinion very well designed. A lot of functions are available directly on the body without having to go into the menu, and with the latest firmware upgrade, you can even press the ok button and change iso setting with one of the control wheel. I find it great.
I have posted the one or other photo taken with this DSLR. Some full size samples are under
K10D Photo Gallery by Dominique Schreckling at pbase.com.
On my last holidays, I have done a three weeks trip through the Egyptian desert, going from oasis to oasis. I was careful about sand, but the weather sealing of the body did a great job. I have some photos of the trip under
Egypt 2007 Photo Gallery by Dominique Schreckling at pbase.com.
As for the lenses, it is true that the lens line up is not on par with Canon or Nikon. But Pentax recognized it and is working hard on extending the range. Apart from that, you can still use lenses from third party manufacturer. I am using a Sigma 17-70, a Tokina 80-400 ATXII and just added a Voigtlander 125/2.5 APO Lanthar macro lens without any problem.
I have also a lot of photos taken with either K10 or K100 on
Around Lake Constance Photo Gallery by Dominique Schreckling at pbase.com
Hope I could help.