Does it have martial arts?
A little as it is about Japan's most famous swordsman. However, because it was a weekly serial, the fight choreography is pretty weak. (They also don't make samurai movies any more so they kind of forgot how to make them.) Also, you will find that japanese sword fights are won very quickly whereas chinese sword fights feature alot of acrobatics (dancing?) and take along time to determine a winner.
The story is very buddhist. What I mean by that is that the protagonist achieves enlightenment by devoting his life to perfecting his craft. The Musashi character's pursuit to become a great samurai changes him from a badass, out-of-control teenager to a man who as he pursues his goal of being a great samurai becomes more compassionate, ultimately losing interest in the martial arts and developing (very unmanly) interests in farming, painting, and poetry. So much for Japan's foremost action hero!