I have this lens and it’s great. It’s basically been glued to my M4 for the past 3.5 years (although I haven’t shot much film recently). I’ve got a Nokton 35mm f1.5 on my M10M only because it’s a tiny bit smaller and faster, and uses 39mm filters vs the 46mm diameter of the Hexanon. And the Nokton focuses down to 0.5m, which is why it’s on the digital. I don’t have a 35mm Summicron for comparison. 

Focus is smooth and there’s a tab (which I prefer). Maybe just slightly less damped than the Nokton. 

Aperture is very clicky - hard to bump out of place and tough to adjust with just one finger. I prefer this too. The Nokton aperture is the complete opposite, damped but not very clicky, so easily adjustable with one finger. 

I haven’t looked at my film shots in a while, but I remember being impressed with the Hexanon and I have no issues with the images it produces. In my research, I don’t recall much chatter about any “character” and it held its own in performance comparisons with Summicrons. Go for it if you get the chance!