Isn't the pitch the same on the QF738 and A330? 32 inches (in most rows)? Everything else would be on par e.g. seat / cabin / IFE quality?
There a huge difference for general passengers between 3-3 and 2-4-2. But beyond that, the 738 has less seat room than the 330.
738 Cattle Class Figures: 17.2" width, 30" Pitch, 5" Recline
A330 Cattle Class Figures 17.5" width, 31" Pitch, 6" Recline
Then there is the average time to get served. I recall the A330 was quite a bit quicker due to more cabins and galleys.
Cabin comfort is much better on the A330. It's very quiet in comparison and the ride is smoother.
The only win for the 738 is average egress time is less than the A330.