I would definitely say Langshan and Polish. The Polish is what makes that neat butterfly/leaf comb there. Crossing a V combed bird with a single combed bird does that.
The Langshan gives him the long legs, the feathering on the legs, and the upright, large tail and sort of short body. The Polish also helps the tail's size and posture as well as his white earlobes. Some hatchery Polish, when crossed out to another breed, do not pass on the crest. Or, who knows, maybe he does have a crest hidden in there. Kind of hard to say.
That or he's a La Fleche x Langshan, but the possibilities there are really slim.