In Fire Strike benchmark of 3DMark, the GeForce GTX 1070 returned about the 80-85% of the score delivered by the GeForce GTX 1080.
Compared to the overclocked ZOTAC GeForce GTX 980 Ti AMP! Extreme, the GTX 1070 gave an about 10% lower score, while it was also 1.3x / 1.1x more powerful than the GTX 980 and AMD's R9 Fury X.
In the 3DMark ky Diver and Cloud Gate benchmarks, the GTX 1070 ranked third, behind ZOTAC GeForce GTX 980 Ti AMP! Extreme and of course the GeForce GTX 1080.
Focusing in the Graphics Score of each test, the score difference between the GTX 1070 and the GTX 1080 was roughly 20%, in favor of the GTX 1080.
The GTX 1070 lagged about 10% behind the ZOTAC GeForce GTX 980 Ti AMP!, but scored about 30% higher then the GeForce GTX 980 and 20% higher than the AMD R9 Fury X.