Gets the better of Colleen Wing, even though he's reluctant to hurt her
VS Master Khan, a sorcerer
Catches a knife thrown at him by a K'un Lun martial artist and throws it back
Gets the better of Looter/Meteor Man (superhuman Spidey villain)
Helps take out Scorpion (and does stuff like catching his tail, breaking it etc)
The Steel Serpent is up there with Shang Chi and Cat when it comes to martial arts. Iron Fist himself said that SS is the greatest martial artist he has ever met save for Shang Chi. Steel Serpent has fought Spider-Man a few times and arguably gotten the better of him in their one on one confrontations. He has also taken on Spidey and the Daughters of the Dragon at once.
Iron Fist stalemates Steel Serpent hand to hand (and even comments how they are evenly matched). SS finally wins by draining his chi/Iron Fist power. Still, the a HtH stalemate is worth posting considering the insane level of Serpent's skill.
Steel Serpent know has the power of the Iron Fist while IF is not powerless. Rematch.
Iron Fist is weakened. It's the end of his endurance and he takes on Steel Serpent and defeats him in a very interesting fashion. Note: This is the original Steel Serpent (also an extremely skilled martial arts master who wanted power in K'un Lun and won a martial arts tournament at the age of 19), not Davos, the second Steel Serpent (who has an outfit similar to Iron Fist's).
Takes on Silver Dragon. Gets the better of her. Then talks a bit with others and she has a chance to attack anew. Iron Fist gets the better of her once more. But then Silver Dragon is revealed to be his mother and Iron Fist is unable to fight back. Basically, gets the better of her twice during the battle.
Fights the Backwards Man and casually busts metallic bands that were holding Spider-Man
Stalemates Spider-Man (albeit Spidey had an edge in that battle as he was more trying to talk, rather than battle)
Fights Scimitar and takes him out with a nerve strike