HKG-SYD is normally an A330 route, so you saw the Airbus F cabin, not the 744 F cabin. On the 744 CX has a much better cabin layout than BA -- 12 seats instead of 14 in the same square footage, for a start! More comfortable seat with better features, better IFE, etc. The Airbus F is a step down but well done within the confines of the aircraft.

The F lounges shine because of the wonderful catering (done by the Pen). The Wing is quite a bit nicer than the Pier, though it is a matter of taste and some like the day rooms at the Pier.