It may be just me, but I've never panicked over f2 3 "pressure" from Superman. It's always easily evaded by a backdash unless he cancels immediately into Super Breath, which won't give him a combo unless you meter-burn it, and blocked Super Breaths don't seem to get Meter-Burned.
You see Superman cancel into trait, it's an easy d1. Link it into a launching special move if you're sure the d1 will hit. I don't think trait cancel off f2 3 gives him "safe" advantage, it's more like a mix-up.
The above strategy worked wonders for me against the Superman players I fought in my pool at EVO...although none of them were quite on the level of KDZ, to be honest.
EDIT: Also as Batman, I can interrupt with my six-frame jab. So can Scorpion and whoever else has a six or seven-frame jab.