Goodbye! Bizarro is sort of a twisted backwards version of Superman with freeze vision, heat breath, and x-ray hearing. He does possess super-strength and flight, and his powers increase when exposed to kryptonite. He speaks in opposites and usually says the opposite of what he means, and thus can be outsmarted due to this backwards thinking. However, unlike Superman, he's not known for pulling his punches which can make him VERY dangerous. Hello!
John Henry Irons has no superhuman abilities; however, he is an extraordinary inventor and engineer, and a natural athlete who frequently displays an impressive degree of strength. In addition, he wears a suit of powered armor which grants him flight, enhanced strength, and endurance. Steel modified his suit many times through his career. The initial "Man of Steel" design was armed with a wrist-mounted rivet gun and the sledgehammer (like the one used by his namesake John Henry) that was ubiquitous for most of his designs. The original design on his breastplate featured a metal version of Superman's "S" insignia in tribute to the (temporarily) deceased hero, which Irons removed after the return of Superman. Two later armor designs incorporated a similar, but different, "S" symbol. A large hammer is also a key weapon in the suit's arsenal. His most current "smart hammer" hits harder the farther it is thrown, is capable of independent flight, and has an on-board computer guidance and analysis system capable of detecting a target's stress points.
http://en.wikipedia.org/wiki/Steel_%28John_Henry_Irons%29#Powers_and_abilitiesMod Note: Some think of Steel as DC's Iron Man, which to an extent is true. However Steel has rumbled with guys on the level of Cyborg, so he's no slouch. With the right armor he's easily Stark's level of power.
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