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I don't own the Zeiss, so can't say for sure. I'd expect it might be a bit better, but I wouldn't expect miracles.
I've gotten myself worked into a frenzy a few times when testing new lenses. Every 85/1.4 I've owned (all of the Nikkors, and the Sigma) will do this. I sometimes shoot a torture test (clothespins on a line, with extra points for being wet with a bright overcast sky in the background) that immediately raises my blood pressure and makes me feel that the lens is clearly flawed. Then I drink a beer, consider what I actually bought the lens to do, and everything's ok again.