If it really is row 4 and 5 you're getting on the FI flight, then you hit the jackpot, as it's indeed business class. You can probably tell from the booking class you'll get in the itinerary.

From experience with other airlines (mainly LH-Group) I can tell that economy extra = economy = back of the bus. And Plus = economy extra = back of the bus, even if your booking class says 'C'.

Anyway, if you get the whole itinerary upgraded for just $20 per way, then it'd be already worth it just for the TLV-CPH legs (and the extra points). Getting seated in C would just be a fantastic bonus, I'd say.

I'll now go to that site and try to make the same kind of itinerary from OSL.