I'm pleased with mine on an M2. The Tele-tessar is complimentary to my 50mm Planar and 35mm Biogon f/2, which all take 43mm filters. I've not felt limited by its f/4.
My latest ZM is the 21mm f/4.5. 46mm filters...arghh! Maybe I need a ZM Sonnar and a Elmarit-M go with it???