I am thinking of using KF miles for an upgrade to F. I will have to purchase C ticket (up to 4x pricey than Y) in order to do so given I have limited KF miles. Alternatively, the cheapest option is purchasing Y and upgrade to C. Given the huge price difference between Y and C
, anyone with experience on this matter please advise? I am hoping to travel from somewhere in europe to singapore (772 or 747) or the other way round. Obviously I know Y to C represents value for money, can F justify that? What is your experience flying F vs C?

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