No it was a 32% FPS increase - if you are going to make comparisons, make like for like - the video in the latest leak was based on FPS so compare to FPS.how about this 980 vs 1080 around 2 years between the 2 and the 1080 was 67% faster overall
http://gpu.userbenchmark.com/Compare/Nvidia-GTX-980-vs-Nvidia-GTX-1080/2576vs3603