Lower deck J on LH is pretty nondescript. Dated business class, comfortable enough lay flat, basically fine (as long as you aren’t caught in a middle seat on a -400). Upper deck feels much smaller (for better or worse), more intimate, and retro. It is on every aviation enthusiast’s bucket list. With 747s an increasing rarity, I choose upstairs (preferably closer to front and window) any …
https://www.reddit.com/r/Lufthansa/comments/19c5k5h/business_upper_or_lower_deck_747400/