Wait.... a brand new Kaby Lake i7 chip is ONLY 1.7 times faster than Apples mobile chip?
Different i7 than the desktop i7's.
the i7 CPU's used in Ultraportables like the SurfacePro's or MacBooks are Ultra Low voltage CPU's that are dual-core with 4 threads (2c/4t), with a strict thermal limit.
That brings both CPU to roughly the same overal thermal limits, (the i7 having slightly higher thermal limits due to the Surface having an Active cooling setup)
But this is NOT the same i7 that's in the Macbook Pro's (which is a 35w quad core/8thread CPU) or a desktop version (a 95+ watt CPU)