i would opt for the 0.95.
BUT....there is a big BUT.
while i do not own either a Hexanon or Takumar 1.2 (yet) i do have these lenses in 50/1.4.
now the above mentioned lenses are desirable because they are sharp wide open and i do use natural light ...and that is whole and sole reason why i would like to have a 1.2 in my stable. besides they are classic lenses and very good weapons in a bar fight
Even though from a digital perspective being able to up the iso to compensate makes it almost a moot point
Almost.......i like to think of the kubric school....he used lenses and particular focal lengths to give a certain quality to a given scene,anyone who has seen Barry Lyndon knows what i mean.
So..should the Zenit have a certain something that can be exploited and it happens to be sharp wide open...i may well be interested.but i would leave it on the shelf if there was no character to the lens . it may be a 'fast' lens but if it has no character...then there is no point getting it for the sake of speed. there are better options available