Japan Airlines has a really fantastic first class product, it’s one of the best with a fantastic mattress pad and excellent (very Japanese) service. I’d suggest they’re in the top seven (in no particular order: Singapore, Emirates, Etihad, Cathay Pacific, ANA, Asiana, JAL).
They’re switching the Tokyo – Sydney route to a Boeing 777-300ER and that means the route will get first class. Award space is widely available on the route, much better flying Sydney – Tokyo than it is flying Tokyo – Sydney.