Yes and on paper the A350-1000 performance figures are only marginally better than the 777. As we know when every Airbus appears its actual performance is worse than expected so in reality the A350-1000 will match the 777. I'm sure the A350 will be much better than the A330/340 but that is all!
Also what is going to power the A350-1000, I don't think they have an engine powerful enough yet?
However, on paper, the A350-1000 economy figures are significantly better than the 777, for same performance (well, not quite, shorter range)
It "only" needs 93-94k thrust engines, compared to 110-115k on the 773ER or 772LR, so powering it shouldn't be problem. Think RR have got a Trent in development for it