Why does it matter? They only put Diamond status or people traveling on First class tickets (ex HKG) in those seats and it still is BC food and drinks. Unless the BC section is overbooked, they are very strict about moving people up. Only gate agents or the ISM will move people (not even lounge agents in HKG can move)

Just flew down to DPS and back this month-- On the way down from HKG I was on a BC ticket and they didn't move me. I got a nice seat up top but other than that, no big deal. On the way home to DCA via HKG, I had a F class ticket all the way home, so at checkin they provided me a F seat ticket from DPS to HKG.

Nice gesture, had seat 1A and there was only 1 other person in the cabin with me. The real kicker was that the staff ended up using most of the other seats to rest after meal service. The food is the same, service the same, just a bigger seat for a 4 hour flight.