The A350XWB is to compete against both the 777 and 787. Yes, the fuselage of the XWB is wider than the 787, but it is almost a foot narrower than the 777.
Good luck with that, Airbus.
The previous A350 used conventional materials. The new A350 PITS (Pie In The Sky) uses composite materials for the fuselage and, perhaps, the wing. Airbus is attempting to push the state of the art to places it has never been before. We have seen how well that works out with the A380 fiasco.
If anybody thinks this thing is going to be developed for 10 Billion Euros, they're dreaming. It will be triple that before Airbus solves all the problems.
They should stick to tried and true technologies. They are coining loot with the A320. Why not just dominate that market?