Hi Kaoru, Chiangi and Tedhl and wideman (what's a pet peeve alert?), thanks for your insight. I guess in order to find a decisive answer, somebody has to go and check in person... I'll let you guys know next time when I'm in HKG.
On the top page of
http://www.cathaypacific.com/ there are quite astonishing fares to TPE and SIN. Too bad they don't have any for KIX, which was the flight of my interest (departs KIX at 22:30, gives me plenty of time to do HND-KIX after work).
Anyway, some of these flights arrive to HKG after 1:30AM, e.g. KIX-HKG arrives at 1:50AM. Obviously the trains are gone, I wonder how we get into the city?