First long haul not in A380 (of the current QF fleet)
Ah, did not read properly! My bad.
I have been on numerous Y trips on A380/30 - can say that they are not bad. I usually only fly as 95% of my travel is self-funded, with the exception of an occasional points upgrade on the A330 QF68 and the PE on A380 (pre-CoVID).
I'm fairly big person, 165cm, the seats are fine for me. I have enough leg room in any seat. Every now and then I get the bulkhead and I enjoy the additional leg room, however, I don't need as much leg room as someone around the 170 or 180 cm. I was able to recline during night flights. I carry an eye mask that helps with sleep.
I tend to walk around the cabin twice in a 8 hour flight - just so to relax the legs and flex a bit.
Another point to note - the seat neighbour. Most of the times, my WP shadow stuck so no need to share the hand rest or someone waking me up to go to the loo. I always choose the aisle seat. However, on my recent flight, I had a neighbour who did not want to get up. She only wanted to get out once in the 8 hour overnight flight, so that worked in my favour.
As WP, the CSM usually keeps checking in with me every 2 hours or so in a day flight to see if I need anything. If I need a drink or a snack, the CSM have always brought me.