Gender: Male Location: United States
Lake Ontario, NY
Iron Fist can pressurize his punch.
Colossus can grow his.
The question of size can't be ignored here. I think Colossus can speed up the pace to effect Iron Fist's chi.
Colossus wins.
Marvel needs to give Colossus a boost. He should mutate further by gaining magnetic powers. Not as powerful as Magneto, but powerful enough to be more interesting than a paperweight.
The only boost Colossus needs is writers who actually give him wins, instead of making him job 24/7. There are far weaker characters with far better feats and track record around so it's not a power-level issue.
Gender: Male Location: United States
Lake Ontario, NY
They say or imply in comics at least 616 that the only person Colossus can't beat is Omega Red.
That means his showings against everyone top to bottom are near perfect.
I would wonder lastly if Sabretooth can kill him though.