Recently found a copy of the Revuenon 55mm f1.2 and immediately got it! Its my very first f1.2 lens. Sweet!
With initial photo-tests, the copy seems to be sharp @ 1.2! Although I have to watch out for bright stuff as I can see some ca.
More real life tests should show us what this lens is really capable of.
Reviewers at http://www.pentaxforums.com/userreviews/Revuenon-55mm-F1.2-MC-for-Pentax.html gave it a 9. hmmm… we’ll just have to see about that!
pics taken with the lens… all at f1.2
Pentax Hunter 
Great lens, it raises to the Porst and Cosina. Good job.