Don't get hung up on the word "mastering"...
You know the language inside and out, nothing left to learn and you speak it with zero foreign accent.
or
You know the martial art inside and out as if you were born with the ability.
I'm going to say the martial art would be tougher. Both can be taught of course, but I don't think the element of instinct required for martial arts can be taught when put to the test.
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