The only person I know that had one was one the other board that you and I used to go to. And that was Tik. He has not been on that board or posted in almost a year.
He used it on a Nikon D70. He got very good results with his. How it would work with the K10D and SR I think that it would be good.
Most people that have reveiwed it did not like it because it was too long or too heavy, or it wasn't TACK SHARP. But I never lesten to what Piexl Peepers or mesurebators say about lenses or cameras.
If you can try one berfore you buy it that would be the best thing.
Sorry I could not have been more help.