I knew that AC had been operating their equipment HNL-SYD, and then someone told me they flew AC YVR-SYD and had to change planes. I checked the Air Canada website the other day and it still looks like they are operating their own equipment all the way to SYD. If I'm not mistake they are using a 767, although I think they have used an A-340 in the past.
Both AC and QANTAS have been in a quandry over that route since the end of CP. CP and QANTAS used to codeshare on the YVR-HNL-SYD route. QANTAS tried for a short time to use their own equipment the entire way, but discontinued that and now routes YVR passengers through LAX and then on to Alaska Airlines for the trip to and from YVR. It was nice seeing the "Kangaroo" at YVR. From a business perspective, it probably doesn't make a whole lot of sense to fly the entire way with a limited number of passengers.