You seemed to specifically ask about Singapore and luggage help. Changi offers free porters, you need to book in advance though.
http://www.changiairport.com/passeng...rrival/baggage

The upper deck on the 747 is rather nice and relaxed, but the stairs are somewhat narrow and steep, but it is a much nicer place to be. Most seats up there also offer direct aisle access too. I would ignore negative points on seat guru about the upper deck too.