I abandoned my attempt at something for Lufthansa after trying Serious Class, Very Serious Class, and Absolutely Serious Class. It’s difficult because Lufthansa is truly German but I’ve always had great experiences with them for precisely that reason. And I have several soft spots for their cabin crews because one time traveling from SFO to MUC (I’d been upgraded to First) the steward cooked my main course meal beside my seat; on another flight I spent most of the time chatting with the cabin crew (this was pre-9/11) and when I deplained they handed me a large bag full of various bottles of wine as a “thanks for not being a dick-head passenger” gift.