I believe if money is no concern, the best F class between Lon-Syd is Singapore airlines A380. (the fare is at least 25% higher than other F). SQ calls this class as suite. I have not travelled in suite so far, but travelled many times in SQ A380 business class. The flight is fantastic (low noise) and having experienced SQ’s F-class in B747 and in B777, which is excellent (service, food, privacy, entertainment), I can only assume it will be better than that in suits.