Posted 24 May 2012 - 12:55 AM
Ooooooh, oooooh, geek talk! I love it!
Keep in mind that Superman has created mental blocks over the years in order to keep his powers in check. He fears that if he were to absolutely cut loose, he may very well destroy the world. A good example of what an out-of-control Superman would look like is Superboy-Prime. He was shown to be able to take on dozens, if not hundreds, of super-powered beings at once, easily murdering Green Lanterns and demi-gods from across the multiverse, like the Superman and Wonder Woman of Earth-15. He also destroyed Earth-15 and would have destroyed the mainstream universes OA (and thus, restarted the Big Bang), if Superman and the Golden Age Superman did not fly him through Rao.
Besides All-Star Superman, Kal-El was also shown to be able to live within the sun in the possible future of DC One Million. Known as "Superman Prime," he essentially became God of the DC Universe, gaining the ability to create life, resurrect the dead, and be completely and absolutely immortal.
Then, there's the Kingdom Come Superman. Though not nearly as powerful as Superman Prime and probably a tad less powerful than Superboy-Prime, his prolonged exposure to Earth's sun definitely made him much more powerful than his younger mainstream counterpart. According to Lex Luthor, during the time of the series, Superman was at the height of his power, and kryptonite could no longer kill him. He also easily survived the nuclear bomb launched by the UN to wipe out the metahuman community. Even more of his superiority was shown during the "Thy Kingdom Come" series, in which he easily overrides Starman's gravitational powers, appears to be as fast as Wally West (according to Jay Garrick), can hear a fight between Hercules and Gog in Gotham City from all the way in Metropolis, completely punks out Hercules, sends Superman flying a city block with one punch, and punches a bolt of lightening from Gog. In the series' epilogue, he is shown to still be alive 1000 years in the future, though as a very old man.