I was returning from SYD to SFO on business and was made aware that the flight was oversold due to the Mardi Gras pax returning home. I was 1K, as was my friend, and neither of our SWU's cleared for the flight home. The whole airport was a mess in fact.
In any case, my best luck for upgrades to SYD has definitely been out of SFO flying mid-week. I have been told that LAX carries a lot more of the transcon pax than SFO.
In any case the International RCC is far superior in SFO than in LAX.