This is the 5881st most frequent Japanese word.
まさる
"まさる" means "to excel" or "to surpass."
まさる is used to express her effort being superior or greater compared to others.
彼女の努力はどんな人にもまさる。
Her effort surpasses anyone's.
まさる is used here to indicate that his knowledge exceeds or surpasses that of another group (experts).
彼の知識は専門家にもまさる。
His knowledge surpasses even that of experts.
まさる refers here to the comparison where the movie's attributes exceed those of others.