1. Odin (Marvel Comics)
Thor (who is generally around the same power level as Superman, apart from being substantially slower) has a father who goes by the name of Odin - as most people know. Odin could smash the living hell out of Superman. As a side effect of some of Odin's more destructive battles, entire galaxies have been destroyed. Yes, you did indeed read that correctly; the collateral damage when Odin fights can be to the extent that entire galaxies are destroyed. So that's not even the full level of his powers - he's not directing his attacks at the galaxies - he's directing them at his opponent (for example Set, the serpent god) but the impact of the attacks destroys the very galaxies around him. The man has also gone toe-to-toe with the likes of Galactus in a one-on-one battle. That's correct; Galactus. The fellow who eats planets for lunch. He is far more durable than Superman, far stronger and possesses a host of esoteric abilities such as telepathy, energy blasts and manipulation, illusion casting, molecular manipulation and the creation of forcefields. He is a Skyfather - a being of a level well above that of Superman and he could literally let Superman wail on him all day without receiving so much as a scratch.