I flew DXB-DOH-SIN r/t in J recently. The seats are of the angled lie-flat type for me they worked quite ok. I had nice sleep both ways. The food service is really great. Overall QR are a really good experience surely beats both TG and SQ on this route. According to another thread here QR are going to introduce the 777 on this route (DOH-SIN-CGK) next year which will improve thing even further.