Other than size, what's the difference between the iPad Air and the Retina iPad mini? They both have an A7 processor, the new MIMO wifi, etc. 

What, if anything, are the technical or spec differences other than screen size?
Here's a modified screenshot of Apple's iPad comparison page, differences are highlighted.

The only differences are the prices, height, width, weight, screen size, and density. Everything else, including the battery life and thickness surprisingly, is exactly the same: