As the guy who has both.
My main user cameras are Contaxes (II & IIa, with the I for occasions) however the important caveat is that I had a cheap source for them here in Japan, and also I can do basic service for them by myself. I love the lens lineup. For me there is just nothing better, especially for color. As simple as.
After service my II and IIa's have run without problems (even 1/1250) for a little over a decade now. In rain and snow and freezing temperatures. The Contax I also - but even I would dissuade anyone from using that as an everyday camera. It's just very quirky in use.
I do agree that Contaxes (and to some extent Nikon S) is an acquired taste. Personally, I love the razor wheel for one-handed shooting in the rain or sneakily where this motion is less obvious than the hand on the lens. With a well serviced camera and lens you can focus external lens mount lenses - no problem.
The Canon L1 shutter can fade, too. It's not immune. Mine did - also the low end hung. So it needs checking for condition too. The clever multi-position finder is prone to fogging and might need a clean. Speaking of that, the view at 35... is ... usable. But, it makes the Contax finder seem roomy - it is very squint-y. It does however have a third finder view called "RF" which is cool for longer lenses or when you want to remind yourself to not compose with the internal finder.
In the end, as others have correctly pointed out, it is easier to get good service for Leica & copy cameras. One thing I would see to, is that ideally it should be a later or factory upgraded model with the metal shutter.
That way it would be - like the Contax - impervious to the sun and shutter burns. It can still break (the one on my Canon 7 did due to over-use and fatigue) but it's a good peace of mind while it lasts.