Here's a great and recent example of him being "a brilliant martial artist and awfully deceptive because of his size" :

Sha po lang (S.P.L.) (Kill Zone)

If you are not interested in the movie but would like to see the long and amazing battle, it is located near the end of the film. In fact, it is the second last scene.

Sammo Hung is a brilliant martial artist and awfully deceptive becuase of his size...