Its good to see posts that show that the Pentax lenses are still performing well on digital FF, quelling some of the 'big theories' that has been thrown around here on PF that the lenses don't work well (and that Pentax is doomed).
Totally agree with you on the Pentax 50/1.2.
Its probably the smallest of the 50mm f1.2 out there among the brands and one of the more 'balanced' wrt the bokeh, doing rather well in most situations.
Some people tout the Rokkor 58/1.2, but its totally over rated imo and the bokeh can be very bad in quite a few situations too (esp at half body focus distances ).
I also read your article about leaving Pentax, which I feel kinda sad about.
Pentax/Ricoh fault imo, with the dragging of feet and non-commitment up until this year.
Many good photographers were lost while they laughed it off at each Pentax interview.