Hi JJ, I use ZM 85 f4 and 50 1.5. VM 15 F4.5III, 35 f1.7, 40 f1.4, 50 f1.5. Leica M Summarit M 75 f2.5, Elmarit M 90 f2.8.
I also still have a couple of LMT lenses. I really am sorry I sold the Voigt 75 f2.5 LMT. Very different to the Leica.
I shopped around for latest edition of all. Bought most new or went through multiple copies if the couple I bought used.
The good news is that I've bought well and will recover at least as much as I spent. Cannot say the same for Sony FE lenses I have sold
I use several Ais/Ai/D lenses on Df and Sony.
I use the M mount lenses for small, light air travel mostly. I have a feeling my wife will want most of the Sony gear if I opt for Z6 or Z7 and sell most if the Olympus gear. I will keep my Pen F and some of the lighter, smaller lenses.
Cheers