I would be interested to see -but am not holdign my breath is the premium pax view on the 380 vs T7 from premium heavy airlines like BA and AF , LH dont have T7s so hard to include them .
You asked, so I'll bite and jump in. I do a fair amount of long haul travel in Premium Eco / Biz and the 380 simply beats the T7 hands down. May have to do with the lower noise level, also that
AFAIK the cabin flies lower. After 12 hours or so you simply arrive in better shape exiting a 380 than a T7.