Between LAX - SYD in Y the product on QF and VA is better than UA/AA/DL. Obviously, if things like toilets become u/s that makes the experience much less pleasant.
I haven't flown on a QF 787 so can't comment about that, but the VA 777 is a tad better than the QF A380 and 747 I reckon in regards to seat comfort etc. Plus the 777 is 9 across in Y. A380 is far ahead in times of cabin noise.