i do not think lh is all flat bed in biz. i find lh flat beds lumpy and very hard. no one seems to mention ua. i like their flat bed. the wine service and availability on ua is far better than lh.
avoid fra, and as muc is growing think about avoiding it also. fra and muc cancel a lot in winter months. zhr is nice. so is vie. does os have lay flats in biz yet? very nice airline. leave 1.5hrs for fra transfer.