A couple of days ago Etihad announced some A380 service changes, as they’ll be discontinuing A380 flights between Abu Dhabi and Melbourne as of October 29, 2017. The plane didn’t fly the route for very long, as Etihad only inaugurated A380 service in the market as of June 2016.
Etihad has a fleet of under a dozen A380s, so they’re quite selective with where they fly the planes (unlike their rival Emirates, which has about 10x as many A380s).
At the time, Etihad hadn’t yet announced which route would be getting the A380 in place of Melbourne, though we now know. Etihad will be introducing a second daily A380 flight between Abu Dhabi and Sydney as of October 29, 2017. I think that’s pretty telling as to whether Etihad has better yields on their Melbourne or Sydney flights.