Well, first Fury X benchmarks are rolling in - as predicted after that leaked AMD bench, it's about as fast as 980 Ti, latter usually being faster in 1440p. Bit disappointing, but maybe better drivers will do something for it, like when 7970 launched.
http://www.guru3d.com/articles_pages/amd_radeon_r9_fury_x_review,1.html
http://www.tomshardware.com/reviews/amd-radeon-r9-fury-x,4196.html