The Sofitel in Hanoi was very nice and I really like the one in Amsterdam although the rooms imo are a little hit an miss with the designs.
LOVE the Sofitel Sukhumvit BKK - spent over 2 months there this year alone and we book all our company travel there as well. Sofitel So BKK is okay, but definitely not as good as Sukhumvit imo. Really wasn't keen on the split elevators and elements theme. Service is definitely decent.