I sort of understand the economics of why they don't work for shorter routes, but those long flights are still extremely necessary, and everything else is godawful.
If you want to fly 747 - Lufthansa is your friend as the sole operator of the passenger version 747-8. Business on the upper deck is a delight in that plane, especially the window seat.
We flew our second leg in a 777 and it was noticeably louder and more airplane like.
The very first one was on one of their newest A380s which even let you pair my Bose Quiet Comforts with the in flight entertainment system over Bluetooth. That really was the dream.
Korean Air and Air China also operate the type, but Lufthansa does fly more than half of the 747-8I production, excluding VIP-configured aircraft.