In general the 85's are the worst, followed by the 50's. They all get better stopped down, so comparing them to the 100L, I'd be careful. Maybe they are still worse, but they are a hell of a lot better at f2.8 than f1.2-1.8.
Personally I haven't compared much because they are all such different lenses I'm never going to choose one over the other because of fringing. Just need to be aware and either stop down, deal with it in PP or perhaps choose another lens (I might very occasionally switch to the 24-105).