I'm flying to JNB on EK761 tonight on the A380 and returning on EK764 in three weeks. It was originally scheduled with 777 so I was thrilled to see the "upgrade" on the Emirates app a couple of days ago. I'm flying Business now, but the return trip will be in Economy. I was very pleased with A380 Economy with Lufthansa a couple of years ago, so will be interesting to "test" it with Emirates as well.