That's interesting, Chris. I had the Mamiya 150 f2.8 (non LS) and it was superb. I sold it and got the Blue Ring 150 because the leaf shutter would give less vibration. In fact, I could have kept the Mamiya because the FP shutter with the XF is essentially vibration-free with MLU.
But I'm very happy with the BR 150 - it's a very sharp and I'm very happy with it.
Its not a bad lens. My 150/2,8 is just sharper especially at the outside. Center is pretty close with the edge perhaps towards the 150/3,5 BR.
I just find it sad that some amazing lenses aren't there anymore. Or let's say not updated with tighter tolerance.
As much as i like the LS in the lenses, I have the feeling it's not as accurate as the FPS. It would be also great in terms of size and weight.
Look at the 80mm D. Could be a great travel lens. Another one is the 45D. If you get an amazing copy it is very close to the new 35. Mine is a great job from 5,6 onwards.