I have be able to get 2 QF FC rewards on the same flight - 3 different times, both before and after they reconfigured the FC cabin. The old QF FC was 16 seats, 2 rows of 4 with a buffet against the wall. The reconfigured cabin is 14 seats. 4 singles on each side and 3 pairs of two in the middle.

I have gotten 2 FC tickets on flights LAX-SYD, but have also gone LAX-MEL. If you are connecting in Australia to go to another city, say PER, then I find MEL a better connection. At MEL the International Terminal is right next to the domestic terminal - so you just walk next door. At SYD you need to go to a transfer area, recheck-in, then get on a bus (always backed up) and take the trip to the domestic terminal.

Both the MEL and SYD domestic lounges have great shower facilities - if you are continuing on.