OK so this is probably not a simple question.

I'm interested in some Leica lenses but I fear that finding clean samples of some lenses that I want is going to be more difficult.

I have a Leica 50mm f2.0 DR Summicron (late), 35mm f2.8 Summaron, and 90mm f2.8 Elmarit. They are all more or less fine in terms of haze/fungus/scratches. Were these coatings "soft"?

I am looking for a collapsible 50mm but I wonder clean samples are more difficult to come by. I'm interested in the Summitar/Summicron/Elmar. Were those coatings worse than the lenses that I own?