One way or another,
what ever you'll say, I strongly believe, this lens was changed somehow, and it's reflect on the overall IQ.
I think this was not just my bad copy, when I've been told the "green ones are way better", and the "Pentax change manufacturer" / what ever this means, because lens is produced under Pentax brand.
This would be just nonsence from seller to say, if just I, and me only was had a bad copy, and non of this claims was true, doesn't it?
There is even threads and reviews on that difference, I've searched it, and you can found it if you want.
IQ from second ver, is lower in test of users, specially in terms of sharpness. I don't know which one of you have a "better, or good copy", but it's obviously overall true, about "quality" of the silver one
This lens was just begining to get sharpness at f8