I have flown in CZ J in A380 once and definitely liked their hard product (mattress was comfy). Flight attendants won't care if you set the seat into bed mode while on tarmac, zzz'ing for hours for takeoff. Given how A380 is quiet while taxing on upper deck, what happened was that I fell asleep and only woke up around when the plane was rotating
... it's a very strange feeling to be in the seat in bed mode while taking off
