12, 45, 75, ???

Good info.  My guess is that I'll stay with 12mm for some time - it appears to match my vision and I'm not ready (yet) to start exploring fish-eyes.

On the other end, the 500mm Tokina is adequate.  The 300mm looks interesting, but is not (yet) a priority.

Which leaves me back at "nice, bright 135mm".  Perhaps I can be convinced to go with the Panasonic 150mm.  Maybe I should dig out a 135mm from my Zuiko bag and swap the adapter from the Tokina - just for fun.  Time to go an rummage through that bag and see what sits up and says "howdy".

--
-Kenneth Sloan