When checking in first class at HKIA, they walk you over to the B counter check in. There are first class and business class lines there. The process only took a few minutes but the questions are similar to what they ask at Heathrow if anyone has done that.

I had carry on and decided to check in at the airport just to see what the process was. There is also a secondary questioning at the gate and then the jetbridge inspection. It would add about 15 minutes to a first class pax but I think if checking in Y the line might get long.