The ultimate face-off between martial arts legends Donnie Yen and Tony Jaa. Who will win? Watch the awesome action to come to your deicison, Donnie Yen grew up in a martial arts family, so he's been practicing kung fu all his life and has 30 years of martial arts training. Tony Jaa started "officially" to learn Muay Thai at 15 or 16, logic tells that Donnie Yen would win this.