Check out an animated storyboard fight for The Avengers: Age Of Ultron between Hulkbuster Iron Man and the Hulk which reveals an alternate finish.
The main differences between the movie fight (below) and the above is that the movie more or less showed Hulk to be a good guy as he realizes he is the cause of all the destruction. The movie also saw the nod to The Avengers Hulk vs Thor punch with Hulkbuster Iron Man punching Hulk at the end of the fight.