I thought there was a psych test to get into Lufthansa ? You want to leave a secure career with a legacy airline in a first world country for a contract job in the third world
I've got friends in there and it's not THAT great. Working five or six multi sector days in a row and recovering on your day off causes the novelty to wear off quite quickly. Pay isn't fantastic, especially if you don't fancy sharing a house with two or three other pilots and want a nice apartment in a reasonable area.
If you plan on having children the school fees will amaze you unless you send them to a local school where they will learn to sing revolutionary songs.
Upgrade opportunity is by no means certain for an expat.
If you were single and unemployed/about to be laid off, then I'd say go for it. As you are, hang onto what you've got and spend your holidays there.