Qantas are late to the party with their Dreamliners. Existing ones are used by Jetstar and IIRC have been configured in a truly horrendous way with an incredibly dense seating configuration (377 seats from memory). Feedback from pax on
www.seatguru.com has been overwhelmingly negative.
Perth is a lovely city in its own right but as a stopover destination it doesn't really cut the mustard and break the journey up much being less than 7 hours flight time. It will be a gamechanger alright, for anyone living in Western Australia.