Cyttorak is deity with spectacular magical power, that can probably be on the same level of the Odin's Power and Zeus Power, so is someone that Classic Thor, the Thor without Odin's power and without those orrible beard with mustache, could put in troubles only with his GodForce Blast probably or anyway give him a run for his money, but i doubt that he can defeat him without help.
Back in topic, we were talking about human beings with great powers.
Magneto is mutant, so in an earth inhabitant and he can be put in the list.
Molecule Man possess external power source so he can't be in the list i think.Anyway Graviton, that is actually dead possess powers more above that of Magneto, he can easy kill him without effort.
Graviton during the last THUNDERBOLTS issues try to make the surface of the earth identical to his face, but he was stopped by the T-Bolts, Magneto can manipulate the earth poles and invert them, but he cannot manipulate the ENTIRE earth surface, gravity is everywhere, Graviton can affect anything with his powers, and he can enhance the density of his body to grant himself unbelievable resistance to injuries, and even if he cannot manipulate the energies along the electromagnetic spectrum, he can create powerful force fields and force bolts that are over the level of Magneto, i mean, Graviton can produce sufficient force to hold down Thor, in his first encounter with the Avengers.
And from Marvel Directory some details about his powers:
He can also erect a gravitational force-field of similar proportions. (Graviton can perform as many as four separate tasks simultaneously. (He has not only lifted a 4 mile wide land mass as high as cloud level, but he has also surrounded himself with a force-field, gravitically held most of the Avengers against a slab of rock, and projected force-bolts at Thor all at the same time.) Graviton can use his power at maximum capacity for up to eight hours before mental fatigue significantly impairs his performance, and considerably longer (up to eighteen hours) if he conserves his energy during that time.
But this files are old compared to the feats of gravity control Graviton shows in his last battle with the T-Bolts.He was going to change the form of Earth continents, causing a worldwide proportion disaster, in the files from marvel directory we can check what he can do in his first days as a supercriminal.And during his last fight with T-Bolts he was more powerful than ever
Magneto magnetic powers grant himself to fly for examples, Graviton can decide if magneto can fly or not, and can put him down and then throw him a mountain.Graviton is more god-like of Magneto, but get defeated cause affected by his god complex he underrate his enemies and get outsmarted.If the writers make him as smart as Reed Richards he would own almost any hero.