I can't attest to QF or JQ numbers to Perth, but across all of yesterday and so far today, VA have moved nearly 2,950 pax to Perth from the east coast on 21 flights (plus one cancellation). Including the cancelled flight, that's 134 pax per flight. There was one very light load in that sample; only 35 odd pax on VA697 out of Melbourne last night.
All the caveats around small samples apply, YMMV.