Lufthansa is currently offering 2 for 1 in First from ARN/GOT. Haven’t checked if offer is matched in other markets.
Prices start from 35.000 SEK per person and includes A380 destinations like JFK and SFO.
I am not sure which First Class Fares they are comparing to. Normally, you can get LH First from ARN to JFK for around 55.000 SEK which is somewhat restricted. The 2-For-1 offer is 37.000 SEK
Nevertheless, a decent offer for a great experience. Please make sure to spend some time at the FCT in FRA if you can.