Pricey, currently 4 (VH-VWW, VWX, VWY, VWZ) with more on order.
VWW and VWX are brand new this year and VWY and VWZ were the second hand ones that entered the fleet last year.
They generally fly MEL-OOL, MEL-CNS and recently introduced to CNS-DRW-SIN, but have also been noted on BNE-CNS, SYD-CNS, SYD-OOL and I guess as more arrive this year they will be introduced to more routes, and you'll see a few more at SYD.