I am similarly wondering about the sixth generation iPad mini and comics. I'm due to buy one soon and reading comics has become a new regular thing for me. Most of my comics are either bought through Apple Books and Google Play Books (in the case of trade paperbacks), the Marvel app (in the case of single issues or trade paperbacks that aren't on the prior two) and DC Universe Infinite (the one subscription service that I have). These are no problem on a fourth/fifth generation iPad Air's screen. Am hoping that the mini's screen isn't too small and that the detail offered by the "Retina" DPI would offset any issues I'd have with a smaller tablet size.