So finaly the new version of the 35mm is out. Not that the old 35mm was bad. But this one is really a step up in every aspect.
Build Quality
The HD Pentax – D FA645 1:3.5 35mm does have a far better build quality then the other Pentax lenses I own. It is very solid, still light. Everything works smoth and tight. Just how a lense should feel. It comes with a hood, and it feels very good on the 645z.

HD Pentax – D FA645 1:3.5 35mm – it comes with a green ring design like other new designed Pentax lenses.
Sharpness:
It’s even sharper then the old version. I do not have any scientific tests to back it up. It is just sharp from what I have seen so far.