I flew WTP to Sydney and back six weeks ago.
Outbound it was QF. First rate. Comfortable, enough leg room for me and the crew were very accommodating. My FF card gets me my own checkin but there was one there for PE anyway.
The return leg was BA, and a different story. The legroom was constrained, the seat uncomfortable and the cabin stuffy. Contrary to my experiences in the past with BA, the service was rather poor. This may have been due to a prolonged period (> 2 hours) having engineering work done in BKK before departing.
At the time I booked, it was 50% more than economy, worth it for the QF leg alone.
Baggage allowance was 46kg. Fantastic, I was able to repatriate quite a bit of gear from here.
SO