I feel I've gotten to the point where I can no longer be killed by Zeus' level 3 super. I'm pretty fast when t come's to reflexes and it didn't take long for me to learn his movement during his level 3. Just stand in the very center of the arena when it's going on and keep your eyes dead fixed on Zeus watching out for how he moves before each attack and don't pay any attention to anyone else. Since you're standing in the center it's easy to see and evade the individual left/right fist slams, and when he moves his arms for the high/low lightning zap, always just jump and immediately air dodge to avoid both no matter which it is.
I'm pretty much at a 90% success rate of never dying during any Zeus level 3 that happens.