I flew A380 Quantas “first class” in the November ice and snow , and was not impressed.
Out of four cabin crews (to and from Sydney) only the first (from London,and mostly British) were good.
The problem is behind First and with only a curtains separation, the noise from children in tourist can ruin the peace (if the cabin staff are not loud enough).Decor , food, and seat nothing special. Think you should think again. My partners seat electrics were faulty too.
After several A380 flights, jet lag/comfort is not dramatically better so you could do better on smaller plane if you shop around.