XIII isn't played a super lot from what I can tell - the game of choice is still KOF2002/2002UM
If you're looking for a XIII machine, there's one in Mong Kok at New Town Mall. (Subway exit D) - I've been looking for others, but XIII machines are a bit harder to come by. =(
Console version seems to be doing alright so far - I've had no problem finding 4 bar lagless connections - so people ARE playing the game.
Hit me up when you come to HK! We can hang!