No Boeing/Airbus wars here, please. Airbus didn't invent the Comet, de Havilland did.
As far as winglets on the B747-400D, they really aren't needed. They add extra weight to an already underpowered design (B744D has 45,700 lbs. per engine, as opposed to 57,900 for B744). The reduced drag incentive only plays out on long-haul flights, which the B744D with a sub-2,000 mile range, does not do.
Now, once the jets reach the halfway point of their (perceived) design life, they'll likely be given extra fuel tanks, winglets, and bigger engines and used intercontinentally, or bought up by cargo operators then re-engined.
And, yes, I always have thought of winglets as an Airbus trademark myself- what planes they make don't have them? Just the A300 and A310-200, AFAIK. That's got to say something about their effectiveness.