Barit,
My understanding was that both came across the Pond, but the one into KLAX operated in with a QF flight number for some reason.
ALso, put it this way - had it come through YSSY/YMML/YBNE, it would've made got a mention in the Aussie papers. Not a sausage, from what I've seen.
Well, not quite true,
this article from the Melbourne Age suggests it the KLAX one came direct from Toulouse.
Also, just to be a pedant, no A380 is "Etihad's". They are all still the manufacturer's problem at the moment. Indeed from reports it seems that the KJFK jaunt was at Lufthansa's behest, so Etihad have zippo to do with it.
Keep an eye on airliners.net, I'm sure some shots of both KLAX and KJFK visits will be on there soon, complete with rego's and C/Ns.