"Ounce for ounce, it's the fastest laptop ever made – twice as fast as the MacBook Pro."
Which model of MacBook Pro?
The 13" Pro is 1.58 kg (3.48 pounds) - about the same as Surface Book - and has a choice of dual-core processors, up to i7 3.1GHz (3.4GHz Turbo)
The 15" Pro is 2.04 kg (4.49 pounds) and has a choice of quad-core processors, up to i7 2.8GHz (4.0GHz Turbo).
The Surface Book pre-order specs just say "i5" or "i7". That's it.