PTU is undoubtly one of To's best work to date, to me, it's as good as The Mission, with a more developed Johny To touch in it. and for me the best John To film has to be Running Out Of Time. i'd like to point out that PTU is a Johny To's "personal" work, meaning that it's solely produced and distributed by his own production company - MilkyWay Image, and there have only been 2 other movies that are considered Milkyway Image films, or Johny To's personal works, one is 1999's Running Out Of Time, and one is The Misson, he's stated that he'd only make one in about every 3 years(numerous times), in his career he's done a lot of movies, but they are mostly block busters. so if you are interested in other movies by him, just know that they are not really the kind of movies he want to make.