My votes for most-asked topics:
*777 vs 747
*Business class versus first class
*First class differences: 777 versus 747
*Upstairs on the 747
*Mini-cabin on 777
*What's the best business class/first class seat
*Which lounge should I use (amenities, closer to xx gate, etc)
*Which lounge will I have access to: arriving F departing J
*HKIA short/minimum transit time
*I have a long layover in HKIA: what should I do