The discussion of this topic might has stopped for a long while I guess. I couldn't help but have to speak out my strong agreement of BEK's comment. I have seen most of WKW's films. The most apparent characteristics in most of his works are the rhythm, the innovative photography, and the fluctuant emotions of all the charactors.  However, in my mine, "Happy Together" is really his masterpiece particularly because of it's tone - the deep sorrow makes people breatheless. I also saw the "In the mood for love" lately. Excellent film and excellent English translation of the movie title. However, the presentation of the affection between the couple seems to be too tractable or conceivable to me. So, HT is still my #1 WKW film.