Comparing similar models at exactly the same price, similar weight and form factor (top of the line Pixel vs. base Macbook Pro 13), information taken from Apple Store and Ars review of the Pixel:

The Pixel has:

Better processor (i7 2.6Ghz vs i5 2.7Ghz)

Slightly better resolution (2560×1700 vs 2560x1600)

Double the RAM (16GB vs 8GB)

The Macbook has:

Double the SSD storage (128 GB vs 64 GB)

Better integrated GPU (Iris Pro 6100 vs HD5500)

So I would say there is no clear-cut winner.

Regardless what people thinks, the base specs for the Pros are quite fair for the price.

EDIT: I was forgetting that the Pixel has a touchscreen display, somehting that Apple doesn't offer at all, at the moment.