I bought a Leica in 2001, mainly to have a quiet camera for indoor work with interchangable lenses. The camera is an older M3 from 1955 with continental shutter speeds and a collapsible 50mm f2 Summicron. The Summicron works well, but is prone to flare. It has a slight internal haze, but no cleaning marks.
The only other Leica lens I have is a 90mm f2.8 tele-elmarit. Opal, sleeping on the printer paper until I disturbed her by turning on the light, is unimpressed. After a year I bought an M2, made in 1958, which works better than the M3 for me -- partly the lower viewfinder magnification for wideangle lenses, but mostly the better condition of the rangefinder patch. The M3 needs an overhaul.
This is my son Christopher. M3 50mm Summicron at f2.
The ring bearer at an Atlanta wedding, before the wedding. M3 90mm Tele-Elmarit
My work place at home. M2, CV 28mm Ultron