rafael
I've tested Jim C's 55 - very nice.
Have never used the 80/2.8, but love the 1.9. While never a Zeiss fan, like Jim I also like the Leica 90/2 non-APO, but unlike JC, I prefer the Mamiya 1.9 over it. The 90/1 APO (also owned) is a whole other kettle of fish - stunning. That said, I sold it in favor of my CV 90/3.5 APO, and I would readily re-buy a Leica 100 APO (or a CV 90) over the 90/2 AA unless I really wanted that F2.
I agree with consensus on the 150/3.5. Nice, but the 150/2.8 A spanks it handily. As mawz says, the 150/3.8 is the 3.5 with a leaf shutter.