I've seen them on the unmentionable middle east airline's A346s, I assume they have them on the 77ws too? Also Emirates definately have them on some of their A380s, as well as showers! I hope the 748 works out, even as just a freighter. Anybody know how many hulls they need to sell to break even?
The advantage for the 747-8 is that those bedrooms can go in space that is currently unused (and can't be used for seats since it can't be occupied for takeoff/landing). All those other aircraft are using potential seating areas for their bedroom suites.
I know what the business case number was for the 747-8 but it's considered proprietary. It's probably garbage anyway since we went significantly over budget (though not nearly as bad as the 787).
BTW, the 747-8 has a much lower noise level during takeoff and landing than the 747-400 - similar noise levels to the 787. Not only are the new engines quieter, but the -8 got a new (quieter) flap system (a surprising amount of the noise during landing is aero noise from the flaps and gear).