does Qantas still operate first class on any of its 747 routes?
There are only 2 active Qantas 747 with First class doing different routes. 3 others don't have first seating. Enter "B747-400" and "VH-OJM" / "VH-OEB" in the drop down search.
They seems to call Sydney home base, flying to destinations like Jo'burg, Haneda, Santiago de Chile, Hong Kong.
If you are thinking of doing a Qantas 747 F before it retires (unknown date), best to book early. Do check the seat map to confirm First Class is available. However, be wary of last minute equipment/aircraft change if you are only after the 747 (F).