At present United is the only operator offering passenger services from the US with its daily UA863/870 flights to SFO with 789s.
There are a number of additional flights inbound to SYD at present from the US:
UA2793 from LAX 787-9 estimated to arrive at 18:01 this evening.
DL8835 from LAX 772LR estimated to arrive at 20:32 this evening.
Also, in addition to QF129/130 operating flights carrying freight only, there have been a number of Air China flights to SYD over the past week which I presume are carrying only freight as well. One is CA593 which is inbound now from PEK and due to arrive at 14:33. Maybe picking up toilet paper.
There have also been three Cathay Pacific flights so far today, operated by 77Ws, non of which are showing on the Sydney Airport flight listings. These maybe freight only flights as well but using, like QANTAS, the passenger flight numbers.