There has been mention of the pre-ASPH 35 Summilux having a hardware interference with some M bodies, but I've never heard of such with any 35 Summicron... of course that just means I've not heard of it!
I just fitted my v.1 Summicron 35mm to a CLE. It fits fine and the focus is smooth from nearest to farthest. RF patch moves appropriately. I've never shot any film with this Summicron on the CLE, just the 28mm Summicron, but it seems to function properly. I don't have a 35 cron ASPH to try... but the pre-FLE 35 Summilux ASPH also fits and functions fine.
The cited article also mentions the goggled lenses not bringing up matching framelines, but fails to warn that the CLE window locations are wrong for the goggles to work, so those lenses are not really useful on this camera (or the CL, M5).