Ok I know this aint gonna make anybody happy but this is how I see it going down.
Lets assume a lightsaber enhanced by the force can cut/kill Superman Lets say that Jedi can do anything and every thing seen in all six movies and the annimated Clone Wars saga (approved by Lucas it can be considered cannon).
Superman powers:
super speed, strenght, senses = great willpower
invulnerabilty = flight = heat vision
hyper/cold breath
Jedi Grandmaster (Yoda/Windu level):
telkinesis (strong enough to move troop carrying ships, so at least 1000 tons)
sense life over interstellar distances
precognition = hyper reflexes = hyper agility
hyper leaping = hyper speed = empathy
lightsaber blocks energy = plant thoughts
the force = can do a lot with it that Im not even gonna write (like weakness detection and all kinds of useful crap)
(oh yeah consider this to take place in the open in a DBZ type fight terain with canyons, rock pillars, all that jazz)
Ok theres the ground rules. Superman and a jedi grandmaster are at an empass over something, both are willing to fight but reluctantly. The jedi tries the mind trick to avoid conflict only to find that Superman's combination of great willpower and Krytonain physiology make him immune.
Supes gently trie to restrain the jedi only to be blasted away into a rock pillar. Supes uses superspeed to make a strong rope from scrub brush and rapidly bind the jedi. The jedi uses the force to untie himself an attacks supes with kicks and punches,The force guides him to weak points and nerve clusters and allows him to penetrate Superman's invulnerabilty.
Superman is half paralyzed and totally surprised, he gets distaance by flying up up and away (heh). He fires back with arctic breath. The jedi easily dodges. Supes goes for hyper breath and as the jedi leaps to safety he changes it to a more widely dispered blast catching the jedi in the gale.The jedi hit the ground hard but uses the force and tumbling to minimize impact.
Superman uses superspeed to blaze in for a coup de grace, but the jedi's precognition and reflexes allow him to dodge. Superman goes for a focused beam of heat vision, out comes the lightsaber to reflect it back to him. Superman is hurt and surprised once again while the jedi rushes in with hyperspeed for a followup. Supes tries to dodge but the jedi predicts his movements with the force and stabs him in the arm rendering it useless. The force tells the jedi whats lethal to Superman and what will stop him.
Superman recoils and spins away at superspeed creating a dust devil to cover his retreat. Hurt twice and actually wounded once Superman decides he can get serious. He backs ofand start tossing large rock and as the jedi slashes them his hurls larger and larger ones forceing the jedi to leap away to safety or delect them with them force. Superman flies all over the place launching missles and heat rays from evey angle and hyper speed. With great effort and a calm mind the jedi keeps up. Superman ups the ante blasting away with hurled rocks from so many directions and at such speed that it seems the jedi will be killed, but the force guides him to a vary narrow route through all the missles. This was Superman's plan all along though! After throwing the last boulder he rockets around the planet to come up behind where he knows the jedi will have to be, thinking that circumnavigating the globe will allow him to escape detection. Nut Superman is not connected with the otherdimentional speed force merely and object in flight in the natural world. Supes find himself slamed by a force push the before he can reassert himself yanked toward his oppenent by a force pull. The jedi has decided he must stop this fight and is drawing Superman into lightsaber range to do severe damage.
Superman takes advantage of the situation, straining he swings his wounded arm forward with his good arm and his palms meet creating a devastating thunderclap/shockwave. The jedi is blasted away by the pressure wave and both ear drums rupture causing him to scream and clasp his hands to his ears, involuntarily dropping his lightsaber. in that split second Superman races forward at blinding speed and stops at the last microsecond to deliver a very pulled punch to the wounded jedi. The jedi falls unconscious to the ground and just to be safe Superman destroys his lightsaber with his heat vision.
Amazing he thinks, that a mere mortal could be so effective against me...I'd better not tell Batman about these guys, he'd be up here training with them in a millisecond!
Superman vs Sith Lord: Master of the Two
All former rules aply with the exception that the sith has the additional powers of force lightning and the force crush
The Sith Lord senses the approach of a great force of good flying through space to his planet to combat him and the dark side. The Sith Lord reaches out into the depth a space with the force and find his foe..yes this one have GREAT power! Aaaah but alas he cannot be turned. He applies force crush and Superman suddenly finds his very being attacked by an invisible force. While Superman can survive for extended periods in space on a single breathe he suddenly finds himself exposed to the cosmos as his space suit implodes and his lungs are focibly squeezed removing all of his air. Superman desperately tries to fly to the nearest planet but his ability to fly is reduced to a battle of wills. The Sith Lord proves stronger and Supermans struggles get weaker and weaker all the while he is being moved closer and closer to the gravity well of the nearest red sun. The Sith Lord had chosen his moment to strike well, and the force had supplied him with knowledge all of his enemy's weaknesses weeks ago...so many weaknesses, heh heh heh. Superman is guided into the nuclear fire of the red sun and across the galaxy a great loss is felt by those who follow the light side of the force.
