Lufthansa wrote back to me. Regarding the seats.
Economy Class Seats (standard, textile, grey/yellow or grey/blue)
Single EUR 280,-
2-seater EUR 310,-
3-seater EUR 360,-
4-seater EUR 410-
Economy-Class, leather, grey or dark blue
Single EUR 410,-
2-seater EUR 620,-
3-seater EUR 930,-
Swivel Chairs with Stand Designed in Italy (Chrome)
Special assembling upon request
”Entrepreneur” EUR 999,- (with arm rests, leather, grey or dark blue)
Business class seats in actual gray/blue Lufthansa long range textile design are EUR 2.500,- per 2-seater row. Lufthansa first class seats in former light gray design are EUR 2.060,- per 2-seater row.