The iPad Mini and iPad Mini 2 Retina Display look very similar when browsing. However, once you zoom into an image is when you can see the differences. The iPad Mini starts to pixelate while the iPad Mini 2 Retina Display maintains sharpness. The above photo is zoomed in and taken with a Panasonic Lumix which doesn't do it justice.

The iPad Mini 2 or Retina Display (pictured above) can be easily held with one hand.