Suggested by Destroyer Luke Cage and Iron Fist have been allies for a long time. They fight well together as they mix skill and power. In a fight though, Iron Fist has long since surpassed Luke Cage. His Iron Fist itself grants him incredible strength that would overpower Luke and he even got the reverse Phoenix powers to deal with the Phoenix Five. At the end of the day, Luke hasn’t really gotten any big power ups that would be enough to overcome Iron Fist’s skill. Iron Fist wins.