Despite that fact that different plot ideas for Kung Fu movie has been fully exploited by now and no new ideas are coming, Wing Chun still stands out in its uniqueness mostly because Michelle Yeoh is its star. If this movie was done by anyone else, it probably would have ended up being a dud, but she brings class to this movie it otherwise would not have had. The movie has very different atmosphere from other Kung Fu movies. While silly things are happening, Michelle Yeoh's action is precise and eye opening. She's the only one playing strait, and it works.
There has been other Kung Fu movies done by female lead, but they are mostly gruesomely violent. While there're lot of action in this movie, none of its action is violent. You won't see any blood, no bones being crushed, and yet it's filled with great action.
Somewhat difficult to find these days, but you owe it to yourself to see this movie at least once.