The SYD - CNS flight usually tracks via Richmond so 34L/16R would be the normal runway allocation. If there was some reason 34L was temporarily unavailable (bird strike inspection, etc.) then the QF926 may have been allocated 34R with a radar departure. If there was no traffic at the time of departure then an assigned heading to the left would be appropriate to track for RIC.
Heavy and Super jets departing for the US often turn right after departing 34L. Albeit they are normally a bit further from the runway when they commence the turn.