Yep, Leung Chiu-Wai of Hard-Boiled is also he of In The Mood for Love, Chungking Express, Tokyo Raiders and A Bullet in the Head. A great actor - maybe HK's best at the moment. He's certainly up there with Lau Ching Wan, anyway.

It's not hard to get mixed up between the two Tony Leungs, though - even the UK release of Hard-Boiled lists Chiu-Wai as the star of The Lover... but that was Kar-Fai. :o
I find it easy to categorize them as Big Tony and Little Tony...