Pirate, some info on these 55mm f/1.2s.
The lens company Tomioka, of Japan, originally designed the 55mm f/1.2 lens for Yashica (whose line of lenses were called Yashinon) in M42 mount. They later went on to produce it for Cosina (Cosinon), Revue (Revuenon), Chinar (Chinon, do you see a trend here?) and with Tomioka's own brand name...wait for it...Tominon. Apparently they also built them for Vivitar (serial # begining with 84), but the only one I've ever seen is on eBay right now. As far as I know, it was never produced in P/KA mount for Pentax, just P/K, but Tomioka did build a 'P' version for Ricoh (Rikenon). I believe Tomioka transitioned off the M42 mount to bayonet mounts in 1974.
The Tomioka 55mm f/1.2 has the following specs:
Focal length: 55mm
Filter size: 58mm
Diaphragm blades: 9
Aperture range: f/1.2 to f/16
Optical formula: 7 elements in 6 groups
Closest focus: 60cm
The Porst Color Reflex 55mm f/1.2 is a different lens, and was (bizarrely) manufactured by Cosina. On some lenses it is branded simply as "Color Reflex". This lens has the following specs:
Focal length: 55mm
Filter size: 55mm
Diaphragm blades: 8
Aperture range: f/1.2 to f/22
Optical formula: 6 elements in 4 groups
Closest focus: 60cm
I read on many forums people saying the Porst is the same as the Tomioka clones,
but it's not! It is also reputedly softer at larger apertures than the Tomioka. I can attest to the Cosina being sharp wide open, with none of the dreaminess exhibited by the Porst. Of course, if you actually
like this dreaminess, what I call
The Milk Effect, then you'll prefer the Porst.
As for Bokeh, have you seen my pub pics? I think the bokeh is great. Bright highlights look very smooth and pleasant, and the focus-to-out-of-focus transition is like warm butter, as Peter demonstrated with his fence shot. But bokeh is about personal taste, and these vary
Cheers,
--M.