Colossus with Mjolnir vs. Thor bare
I had a dream last night that Thor, seeking a challenge, gave Colossus his hammer to fight him.
Classic Colossus gets Mjolnir and has access only to its throwing, flying, and hitting abilities. That means he can strike with it any kind of way, take flight, and call it back. He can't affect the weather or anything else. He would use it mostly to strike and throw and not so much cheesy remote control stuff.
Thor has to fight bare handed with no lightning powers or anything else.
Thor cannot lift Mjolnir nor can he access it in any way.
Fight starts 20 feet away on a featureless environment.
Who wins?