Originally posted by Batman-Prime
DC Earth is quite big and resourceful (like Marvel Earth), with Swamp-Thing, Phantom Stranger and army of Mystics and Superheroes who are used to fight Universal meanies.
Celestials and Imperiex are pretty much a few leagues above those. Admittedly, it wouldn't be a stomp.
Personally I rate the Celestials higher than Imperiex's proves, but its still a heck of a fight.