Flew KLM 2009- HK to Amsterdam. Old plane, crap entertainment system.
Flew Lufthansa 2010 - HK to Frankfurt, entertainment system broken.
Flew Cathay 2009- HK to Amsterdam, old beat up plane. This I found shocking as usually Cathay is very good.
Also flew KLM Bangkok to Amsterdam. Utter crap. Beat up old plane with grumpy old staff.
Best flight to Europe for me has been HK-London on Air New Zealand. Modern plane, modern entertainment system, good food. Air France from Singapore to Paris was great as well. Not sure if they fly from HK. Decent seats, working entertainment system, and decent food. That's all ya need.