I’ve always considered the Australian accent to be fairly homogeneous across regions, but certainly there isn’t the extreme diversity that the UK and America have. How much diversity is there, and what are the various characteristics? How long would it take you to tell a Cockroach from a Cane Toad when you meet him in the street?
What llandar said, but basically we sound a bit more ‘posh’.
I’ve heard it attributed to the fact that Adelaide didn’t have convicts, just free settlers. So more refined British accents influenced the way people spoke as opposed to broader and more diverse accents. Could be complete rubbish, not sure.