yea, i say Supes would still own him, but only cuz his speed cuz i think the ultimate thing is probably in par with supes', and the exiles:FV version i think is far stronger than supes. his powers dont really make a difference either cuz mimic tried lazer vision like supes on the thing many times and the thing barely noticed it, and then the only othr power he has is super hearing, sight, and x-ray vision, and how the hell would that help?! so yea, supes would win, but only if he uses his speed to his advantage. If he brawls w/ ultimate thing, supes and thing stalemate for awhile and after a while Thing gets the upper hand, if he brawls with exiles: FV Thing, supes gets the beating of his life right from the start.
Until I see Ultimate Thing move a planet. Then no. His strength is not impressive. Superman had done things that defy imagination.
You're comparing Mimic's laser vision which has HALF of Cyclop's power to Superman's heat vision which has destroyed leagues of spaceship armadas in a single glance.
Freeze Breath. It held Doomsday. Thing ain't gonna break it.
The Thing is nowhere in Superman's league. Superman's solar energy gives him the ability to heal rapidly. The Thing is outclassed. In ANY universe.