Lufthansa opened in 2005 a separate terminal in Frankfurt for first-class ticket holders and very top-tier frequent fliers, offering white-tablecloth dining, baths with rubber duckies, cigar rooms and fancy bars.
Here they have one Galleries Lounge for business, the First lounge for First, and just to confuse things, only in Terminal 5 (there are also lounges in 1 and 3) they have the Concorde Room, also for First class passengers, with hotel-style rooms featuring beds and en suite bathrooms, plus restaurant-style dining.