Iron Man launched the Marvel Studios shared universe leading to The Avengers, and Man of Steel launched WB's own movie universe leading to Batman Vs. Superman and Justice League.
So what happens when the two heavyweights collide?!
Check out a fan-made trailer for Superman Vs. Iron Man above.
More than likely Iron Man would have some sort of SupermanBuster Armor (maybe the Thorbuster suit?), but the creator of the video does incorporate Tony's latest heavyweight armor in addition to some cool effects to put Iron Man on par with Superman.