The clip where Ip Man fights Sir Bik is amazing. Showing Martial arts is about skill, not youth or power.

As for my favorite anime Martial artist, that would have to be Krillin from Dragonball. Despite being surrounded by godlike world breakers, Krillin never shys away from a fight, whether it be demons, space tyrants or a Pure evil in the form of a half naked pink guy. Truly a hero if there ever was one.