You realise that even if you wanted Qantas Points, you'd earn more if you used the Platinum card on your purchases but then waited for a transfer bonus to QFF?
For instance, Plat Charge normally earns 2.25 MR points per $1, which after a 2:1 conversion is 1.125 Qantas points. Ultimate earns 1.25, but if you transfer from Platinum when there's a bonus running (like the 25% offer last month, you get even more). 1.125 + 25% = 1.406 Qantas points earned per $1.
(That's when the earn rate is normal, of course, and you'd earn more points on Qantas flight bookings etc via Ultimate, but that's for everyday spend. Different if you always need the points in your account ASAP, I guess, but more rewarding if you can wait for a bonus.)