Cyborg Superman would kick Magnetos ass. And Supermans taken care of Cyborg a number of times.
A guy who can control metal? Try a guy who can control metal, and computers, and has the same strength and powers Superman has.
How insane do you have to be before you manage to type something as rediculous as 'Magneto would beat super...su...sup' look I can't even type it, it's that retarded.