I've seen a couple of comments that mention it, but I flew Singapore Airlines for the first time recently on the A380 and found the business class seat to be uncomfortably hard. When I sat down it was like sitting on a wooden bench, and I had to get a spare duvet to put down which made it just about bearable to sit and lie on. Is this common for all seats, or just for some - it really felt like all the padding had been flattened and you could feel the metal below? It would certainly put me off flying with them again if all the seats are like this.
I did like the spaciousness of the seat, and it was pretty comfortable apart from this, although I did find having the cubby hole for your feet not being in-line with the seat a little odd.