if you're booking the flight through a dl or other codesharing they won't obviously tell you a thing about F/class. As for fare difference it depends on the route it's not standard...anyway i have no seat map in front of me but row 1-2 should be exit row and they are not given away when booking. they can be de-blocked at checkin stage.but i'm 100% sure ke sells F/class tkts on that route