Paul, you're thinking of a later Mamiya mount like ZE. Mamiya SX lenses are just M42 lenses with an extra little pin to allow open aperture metering, but only on a SX camera. Fujica had a similar-but-different extension to the M42 mount. Mounting these M42-plus lenses to other M42 are all in the category of "it will mount, unless in the rare case that it fouls something."
Most name brand fixed-focal length lenses are pretty good. You can spend a lot of time questing for the magical lens, or just get some Mamiya, Fujis, or Takumars and spend more time taking photos. Also, for all of these modern (postwar) SLR lenses from the 40s to the 70s, you get at least single-layer AR coating. This is needed in a modern lens with several groups to minimize reflections. Perhaps what the OP thinks they don't care about is multicoating, which arrives in the 70s to 80s and is more necessary for complex lenses like zooms.