The following are my favorite Leica R lenses. I have owned them all at some point or another. Today I have the 100 and 280.

Leica 19/2.8 II
Leica 100/2.8 APO macro
Leica 180/2.8 APO
Leica 280/4 APO

These lenses are the best of the best. Amazing color rendition and contrast. These lenses are getting very very expensive on the used market and I have made money turning several copies over the years.