Marvin is a great App for reading, the best by far.
One thing I would like to mention: The german iOS app "Thalia eReading" manages to display the text even a little sharper (on non-retina devices) than Marvin - the letters look a bit like embossed text (only works with In-App purchases).
https://itunes.apple.com/de/app/thal...350742971?mt=8
Nevertheless the Thalia app lacks all the other wonderful features of Marvin.
If Marvin managed to display text like the "Thalia eReading" app, it would be absolutely outstanding!
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Lars