Qantas long haul are pretty standard - nothing exceptional but never bad. One thing to think about is that their prices are often higher on some routes - eg Australia - UK and Australia - USA due to a high level of visiting friends & relations traffic. You can make big savings by going via a European airport rather than LHR for example.
As SLF says there are big benefits in flying non-stop trans pacific - going via Asia adds a lot of time t the trip - and definitely aim for a 380 - they have more space and are significantly quieter inside