Bingley
Veteran
From direct experience the one Leitz lens that should be on M2 is the 35mm F2.8 Summaron. That is as good as it gets IMO. Buy a few adapters for your LTM Canons and you are set. Enjoy.
It would make some sense to keep the Canon 35/1.5, sell the Canon 35/1.8, and get the 35 Summaron as recommended by a number of posters here. One fast 35 for low light and shallow dof shots; and a lovely Leica 35 as carry-everywhere, daylight shooting moderate wide.