2. Sentry (Marvel Comics)
Sentry is insanely powerful. The only thing he is inferior to Superman with regard to is his speed - but that doesn't matter at all. To illustrate why, I will simply list some of the crazy feats of power Sentry has carried out... Sentry is said to have fought Galactus to a stalemate Galactus being the devourer of planets and a character capable of destroying galaxies. If he can even come close to doing that, fighting Superman would be a cakewalk. He has defeated the Molecule Man at his own game (matter manipulation) and bearing in mind Molecule Man is a MASSIVELY powerful character, this is no mean feat. It essentially means that he could turn Superman into a pencil. Strength-wise, he's powered through the Crimson Bands a powerful magic restraining spell which the likes of the Hulk have failed to escape from - and, with one hand, casually stopped a swing of Terrax's axe-wielding hands - the same attack that has destroyed a planet before - which is also a crazy feat of durability that proves nothing that Superman could physically do to him would hurt him. He has destroyed a planet with his energy flares, which can also be seen in the normal world whilst he is in a microverse, which is an INSANE feat of power. A single wide-angled energy blast against Superman would kill the Kryptonian outright.