Sorry if I'm being thick, but where do you see the price? If it's what you report, that's a seriously problem. I can get Leica glass for that kind of money.
The fact that it's a 25mm and covers the 645 format makes me believe that the price is indeed very good:
28mm Hasselblad : 4390 US$ (do not cover the circle, needs digital corrections)
28mm Phase one : 4490 US$
Leica don't have a truly equivalent lens since the 35mm is very fast, and far most expensive as expected from the aperture.
Of course the Pentax is sold as a very low cost entry to the medium format word. So that hurts expectations.
Just my take