Number 6 is quite correct, but is really answering a different question: What really matters to you flying? Kind of like the hierarchy of needs (Maslow?), the question here is more why fly F on Airline A vs. Airline B, or J on Airline A etc.

I've not yet flown international F (not until next summer!), but hope that the total experience is demonstratably superior to J. Food (caviar, anyone?), wine, etc., should be a clear step up, even though it will not and can not compare with a good restaurant meal. Seats, service as well.

Otherwise, why do you fly F? The difference between international F and Y fares would buy you a week's stay at the Peninsula in Hong Kong (much better than any F seat!) and staggeringly good meals.