787 and 350 in a class of their own regarding high altitude cruising FL’s at standard weighs. Both with latest wing designs. Traditionally A330’s will fly at higher FL’s than 777’s at comparable weights matching the historical mantra of Airbus having more wing than thrust and vise versa for Boeing. A mate on the 777-300ER used to say his machine had thrust to take them up to FL’s the wing just didn’t want to go to.