SAS Business doesn't compare to Lufthansa F (obviously), given its a night flight, I wouldn't bother. You'll sleep fine in SK's Business, if you have a hard time sleeping on planes, take a sleeping aid. For a daytime journey (to the west coast), I would put additional effort into LH F.

On LH F you'll get a considerably better seat (and bed), better food, better IFE and considerably better service on the product outside of the other F perks. The only downside is that you'd have to transfer in FRA or MUC.