I have a bunch of old and some new Leica glass which I use with an M240. But I wanted something with better focusing capabilities because the M240 is limited to center focus via either rangefinder or live view, which often requires focus and recomposing with it's associated focusing inaccuracies.
Plus I've been really put off by the abandonment of the Leica M9, to the point that I am very reluctant to buy any thing from Leica. If their cameras are effectively disposable now, I'll probably just get a series of cheaper disposable cameras with the same $ if they'll do the job well enough.
I tried a Sony A7II but it didn't play well with some of the M lenses, particularly a current 50mm Summilux ASPH, although doing ok with others.
So I got the Canon EOS R and RP. They were pretty inexpensive on sale, just slightly more than $1k. The Canons allow zooming into any part of the frame at either 5x or 10x, resulting in near perfect focus for almost everything except maybe fast moving subjects, which I rarely if ever shoot.
I haven't experienced the smearing or color shift problems with the Canon mirrorless cameras that others report with some mirrorless gear. I've used wide angle, medium and telephoto focal lengths without any significant problems so far. But I don't claim my experience is extensive, just no problems yet. I was expecting difficulties with a modern 21mm Super Elmar, but it did just fine, at least for my tastes, as you can see in the example below.
Here are 2 test shots taken the day I got the Canon RP, while driving through the French Quarter in New Orleans, just pulling over and shooting out the driver's side window.
Leica 21mm super elmar m f/ 3.4 on Canon EOS RP.
_MG_8249 by
Brusby, on Flickr
35mm Summaron f2.8 on EOS RP
_MG_8247 - Summer Sunset French Quarter New Orleans by
Brusby, on Flickr