Jackie Chan is a very good comedy/martial arts star. He does one kind of martial arts that Jet Li doesn't know how to do and Jet Li does a martial art that Jackie Chan doesn't know how to do. You can both go to two Chinese restaurants but both can have different kinds of food.
I think documentaries are the greatest way to educate an entire generation that doesn't often look back to learn anything about the history that provided a safe haven for so many of us today.