Lotusm50 Offline Upload & Sell: Off
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The "best" might be the Zeiss 55 f1.2 Planar Jahre, but you might not like the $5000 price tag.
The Cosina (or Porst, or Revuenon) 55.1.2 (Pentax K mount) is pretty good for about $250 currently. Outstanding bokeh better than most, if not all the lenses already mentioned (yes, IMHO, including the Rokkor 58/1.2 whose bokeh is more of an acquired taste), it's sharpness wide open is not significantly different than the other choices. It is, however, a little more prone to flare.
If you are willing to go to f1.4, I'm not sure the Voigtlander 58mm SLII is the best choice. It is a good value choice, however. It is not as good as the Zeiss ZF 50/1.4 in terms of bokeh (although similar in character), sharpness, CA, color and flare, but it is about $150 cheaper. An old Contax Zeiss 50/1.4 Planar is also a good value choice, although it's bokeh in certain situations can become a little nervous. You could also try an old Pentax Takumar 50/1.4 (screw mount), certainly comparable to many of the lenses mentioned, and quite inexpensive.
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