Quote: Good = 56.25%
Bad = 43.75%
Of course compiling that stat from this thread is not a true reflection of the quality of this lens, and is probably a form of selection bias.
People are more likely to search out a possible problem with their lens (pentax forums would be one of the first places found), and then post here.
Lots of people with a good copy of this lens will never even bother visiting here, even fewer still would bother to register, and fewer still to post come post and say that their lens was good, but never come back here again.
The only one that would have any accurate numbers on this is Pentax, and chances are slim they would ever release that info.
The idea behind this thread is a decent idea though, just to see if there is any correlation between model numbers and bad lenses.