two recent ones come to mind:
1. from the avengers, the first fight aboard the avenger's home ship (can't remember the name of it). incredible blend of computer graphics and live action, way beyond anything else i had seen at the time.
2. colin firth's rampage in kingsman: the secret service. again, this one blew me away with the live action / cg blending. for the first time, i saw a new form of seamless, prolonged "fast motion" fight scene. already copied by the latest mad max movie.
i recall how dated the dark knight rises felt after seeing the first avenger's movie. christian bale's clunky fight scenes were so boring... after seeing kingsman, i felt the same way about the second avengers movie -- they got one-upped.