the sword prevented odin from summoning all of the odinpower. no reason to think it would affect zeus in anyway OTHER than as a really big sword. in later issues, i'm pretty sure the odinpower was shown to be greater than surtur. if odin>surtur, then it follows zeus>surtur. but i think the levels of power are very close.
Odinforce is a form of magical manipulation, zeus also possessed a vast form of magial manipulation, plus he is an elemental with the powers of the heavens his to control and he have precognition that make the spidey sense look like crap zeus is by all means odin equal as marvel have stated and even if you read the profiles of other skyfather their energy powers are either said to be on par with odin or zeus or below odin and zeus