The Kindle has the best dictionaries by a long shot. Sony is a reasonably close second; Kobo and the nook a distant third. The Kindle has by far the best supply of 3rd party commercial dictionaries (search the Kindle Store for "Dictionary" and you'll find hundreds of them). You can't add extra dictionaries at all (to the best of my knowledge) to the Sony, nook, or Kobo. Bookeen, Pocketbook, etc, do let you add dictionaries, but they're limited to the public domain "word-list" type dictionaries rather than proper commercial ones (AFAIK - I'm sure someone will correct me if I'm wrong).
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