The 110 is easily the sharpest of the normal RZ lenses, newer, better and sharper than the 90 or 127 in my experience. The 65 L/A is a tiny bit sharper than the 110 but not that much. The 110 is more consistent across the frame, at all apertures. Check the Chris Perez tests. Also, Modern and Popular photo both did tests of the RZ lenses back in the day.

Both the RZ 50s are quite good. Of course the ULD is better but if you are not shooting close-up the regular 50 is a bargain and still very good. I have had both at the same time. Also have the 65 L/A and 110. I'd not hesitate to get a normal 50 (nonULD) if you want a really wide lens.

the 65 L/A can be had for under $200 with some patience on Ebay. I paid $190 for mine in as-new condition. Usually the 50 non-ULD can be had anywhere in the $200-350 range. ULD 50 is usually at least $575-675.

FWIW
-Ed