Wow! I just don't know what to say. This thread is so full of ignorance. You guys are so wrong. If right were a country, you'd all be on the edge of the milky way. Where to begin?
First of all, Vader is alot faster than any of you think. He has force speed, which augments all of his movements, to the point of allowing him to move at speeds above the speed of light. Proof? We see him and many other Jedi able to deflect lazers all of the time on all sides. And lazers, by definition, are as fast as the speed of light. Superman rarely even moves at the speed of sound. He wouldn't know what hit him.
Secondly, the lightsaber would more than easily cut through Superman. Are any of you aware that blast doors and blasters are in the range of gigatons and megatons in the starwars universe. A blast door itself is around 1000 megatons or gigatons, yet in Episode 1, we see quigon easily piercing through one with his lightsaber. Whereas in Kingdom Come, we see superman draw blood from a friggin sword. Sliced, diced, filletted. Superman would be dead meat.
Third, the force would work on Supes. We have the remember that the force has the nearly the same properties of magic, which has costed Superman many battles. He is always beaten by magic. Heck, Vader wouldn't even have to be in the same room to beat Superman.
He could force choke him in the comfort of his favorite chair, with Superman in his sites, via holo net, just as he had done in the empire strikes back.
Lastly, Jedi are able to see into the future. Vader would have predicted the fight, thus would already be prepared. He'd just seen an armada to earth, and capture lois lane. Or he'd have Boba fett steal a kryptonite shard, and have him bring Superman's head back on a platter
Vader would destroy Superman, easily.