This is interesting.
I’ve just travelled out Business on the A380 to Miami and came back on the 747 (Business, upstairs).
The A380 is superb experience. Was really impressed with the service. So efficient that they kept coming around and topping up our glasses, often offered us additional nuts, food and asked if we needed anything else. The entertainment system is an upgrade and the toilets were like changing rooms compared to the dated 747.
We were also impressed with the First Class Terminal 3 lounge. Plenty of champagne, few people at the bar, a sit down meal service and a fairly quiet lounge, overall.