I don't know how big the intersection is between gadget nerds and comic book nerds, but based on how many questions we've gotten about how legible and enjoyable comics are on the new Retina iPad mini, I'm guessing it's pretty close to Galactus big. The iPad Air, thanks to its large, 9.7-inch 2048x1536 display, is currently undisputed king of the comic book tablets. The Retina iPad mini, however, includes just as many pixels, albeit crammed down into a 7.9-inch display. That works out to 264 pixels-per-inch (ppi) for the Air, and 326ppi for the mini. That means word bubbles are smaller, lettering is smaller - everything is smaller. But is it too small?