Loki vs. Ironman
So instead of Ironman fighting Thor in the jungle (in the Avengers movie), it's Loki that he's fighting. Loki gets his staff. Both combatants are fighting to KO his opponent, but are willing to kill if necessary.
Needless to say, these are movie versions we're talking about. Loki may not be as strong as Thor but Ironman also won't be benefiting from a 400% charge like he did with Thor's lightning.
Who wins?