The Nikon Series E 50mm and 100mm, both very good. And lightweight.
The m4/3 Olympus pancake 17mm f2.8 kit lens, usually panned on websites but my copy is excellent with great color rendition.
The Leica M Tele-Elmar 135mm f4, difficult to use with only a rangefinder patch but on a mirrorless camera, OMG is that lens sharp. Cheap for a Leitz lens.