Originally Posted by HansTWN
While you two are having your little discussion on the side, that still leaves uncontested the bold statement by JSWolf "more standard epub books are being sold world wide than Kindle books". Do we have any real numbers here? Any educated guesses by the experts? My money would be on Amazon -- especially since official ebooks in languages other than English are still a lot less widely available/accepted by readers. Even if there are more epub compatible readers out there, many people might use them to read PD or library books, or even pirated materials. Not all reading material is paid for.
That being said, even if Amazon had only a 40% market share, calling epub THE standard wouldn't make sense.
I seriously doubt Amazon has less than half the ebook market. And even if they do have a minority share, once you subtract Apple's walled garden and B&N's walled garden Amazon will have a larger market share than standard Epub.