Somebody at Synergy Cycling Tech Services, I don't know who, said:
"NOTHING Zeus ever made was superior to Campy."
Unsigned, absolute statements, like this one make me giggle. (they remind me of all the racer wannabees in the 70's who laughed at Shimano & SunTour)
The archives are full of Campy/Zeus comparisons. Read them, they're interesting.
Never having used a Zeus headset, all I can say about them is that they are mighty pretty, to my eyes. Having used them for years and years I can say that Zeus cranks, bottom brackets and hubs are mighty pretty and quite reliable.