Actually you´re off the track Rabenschlag. Do you think that a FRA-PDX service would be feasible without FRA being LH´s main hub? I seriously doubt it as the local traffic from FRA is just too small for this destination and basically all long-hauls rely on feeder/conncetion traffic.
Lufthansa has choosen the A340/B747 combo for Atlantic ops as it serves them best - and in future we will see the A333s join in, too. I really don´t see how the B777 fits into this scheme - their job is don by the A340-300s and soon the A340-600s.
The A380s are destined for routes such as FRA-NRT, FRA-HKG, FRA-SIN, FRA-JFK, FRA-LAX, FRA-SFO, FRA-MEX, all the big ones where LH has already capacity problems today.
Anyway - quite a clever choice on LH´s side, they are the first european carrier to serve PDX which should add a bonus onboth sides: additional paxfrom PDX fed into LH´s Europe network and european passangers flying with LH because it is the fastest way to get to PDX.