The Cybook zooms the page out to fit the screen. If the PDF is A4-size, the letters will typically be too small, and the margins too large. You can also display it in landscape (page width set to screen height), then each page will usually be displayed in 3 screens, although it would fit in 2.
If you manage to crop the margins out of the A4, it can be readable. But the best solution is to customize the PDF for the actual screen size, so that the letters are the "right" size. The Cybook can display a PDF at full screen, with no status bar or similar, I believe other devices can't.
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