well, i guess someone started me on the wrong system 5 years ago
i've used ME's ME supers and always admired the LX and still have a ricoh xr1000s that uses k so i always had a spot for pentax and when i went digital, the *istDL was the most affordable.
back then, tokina made k mount lenses, today, they don't. tamron doesn't seem to be making new k mount lenses as well. sure, the existing ones are still in production, but no new ones AFAIK. it's only sigma that is still producing K mount.
and while the miniaturization of the K10/K20/K200 body was positively received, there had to be some engineering compromises made.
tolerances had to be much, much tighter and that might be one of the reasons why a camera that isn't "tuned" exactly 100% right from the factory could easily have issues.
the k20/k200 - this series had the least issues/problems.
the k7/kx - blur, k5/kr - FF although NONE recognized officially by pentax.
nikon and canon has had their issues too. nikon recalled the D5000 (i think) for a problem with camera's not powering up. they also acknowledged the D7k's video hot pixel issue rather quickly after launch and put a fix rather quickly as well.
and i do admire pentax for officially acknowledging the stain problem and doing a free exchange/repair.
i really hope they can get the FF issue fixed via firmware. i don't have a k5 or kr, but those who are experiencing this issue will benefit by this.
i do need a FW upgrade for my k200 though.
so after 5 years w/ pentax digital i decided to go dual and try nikon and so far with its limitations and all, i have not regretted it.
YMMV