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The Opus is smaller than the Gen3 (5" vs. 6" screen, but many people say the difference is not so noticeable while reading), and has an accelerometer, that allows you to use the reader in landscape orientation, and the text rotates automatically; it also has page-turn buttons which are probably easier to use.
The Cybooks let you choose whatever font you like (you just upload the TTF file), in 12 sizes, and you can also choose full justification or right alignment for the text. The TOC navigation is a bit primitive, you can use multi-level TOCs, but they're displayed flat. You can organize your books in a folder structure and navigate it easily.
I don't know about the Sony readers, but I think I read they have a built-in dictionary?
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