Hahah. How do you figure that?
It's CPU is not even close to that of the rMBP. The entry level Surface Pro has a CPU below that of the entry level MacBook Air.
Plus the MacBook Air will destroy it in I/O speeds.
I agree that Microsoft has a hit here, and that this is an amazing product.
As for performance, it uses the ultra-low voltage processors which are comparable to the ones in the MacBook Air, and not the Pro. Performance-wise, I don't think the Surface Pro 3 will beat the Pro.
I haven't seen the specs on the chips yet, and Sickboy you're cherry picking comparisons, but I would think the i7s in the SP3 would be at least comparable to the i5s in the low end rMBPs.
And stuff like I/O speeds is really stretching. The SP3 display is far more like a rMBP than a MBA. Never mind the additional touch and pen functionality of the display.
For the record, I don't think the SP3 will outperform a lower end rMBP. I just think that for many users {and that excludes those who do highly intensive tasks like gaming and video editing etc.. }, the real world differences between the two won't be noticeable. Much like for many users the choice between the 13 MBA and rMBP really comes down to the display quality.