MacBook Pro Retina VS MacBook Air 2012 Diablo III Performance

I would like to know out of those of you who have tried, the performance difference between these two laptops in Diablo III or any game in general. I want to get a feel of the difference in the processing power.

And if you could post the configuration of your laptop that'd be great.

The two I am particularly interested in are:

Macbook Pro Retina
8 GB RAM
VS
Macbook Air 13 inch
8 GB RAM
i5 Core

and

Macbook Pro Retina
8 GB RAM
VS
Macbook Pro Retina
16 GB RAM

(The extra RAM shouldn't make any difference if it is not all being used but I just want to see anyways)

and

Macbook Air 13 inch
8 GB RAM
i7 Core
VS
Macbook Air 13 inch
8 GB RAM
i5 Core