From what people say, this Premium Terminal's caused people a lot of grief, as they can get downgraded. This is a problem especially when travelling with other people.
What do you mean with that??
For transit passengers, BOTH your inbound AND outbound must be in J/F otherwise they will not permit you to access the Premium Terminal. They are very protective of the sanctity of the terminal.
They never asked me to show the boarding pass of the incoming flight. Only the boarding pass for the outgoing flight and then they will direct you to the business of first lounge...