I agree we don't really have any evidence to say Ultra 5w40 Euro is the best oil to point a Euro car owner to. I'm sure we never will.
However, I think we can probably agree it would be a solid, good choice. I just don't know about going out of the way to pay more and mail order, etc.
I can confirm now that at least my Penske dealership has switched from their Formula M to this Ultra Euro 5w40. Penske made the dealerships change due to losing the Mobil 1 contract and the new contract with Pennzoil including in motor-sports.
Therefore, you will see many Merc dealerships using this very oil now. That should give us plenty of used analysis to take a look at, although owners may assume they have Mobil 1 in the car.