Terminal 4 is mostly empty and there periods of hours with no arrivals and some with no departures. This is due to refurbishment. Qantas are moving ( back ) to the hole in the ground that is Terminal 3. If you think T4 isn't great, just wait until they cram you into the gate rooms on T3 miles from anywhere. I hate those gate rooms as if there is any delay I am trapped in there!
Give me T5 or T4 anyday. Actually the Europier is quite civilied too.