If by 'miss' you mean what the K1 has that the K2 doesn't, then the SD card, hands down.
If you mean 'miss' as in want but didn't get, then it would be folders or some other way to manage content.
Amazon may tout that the K2 can hold 1500 books, but without a way to manage them in folders or some other directory-type system, they may as well be stashed away with the Ark in that last scene in
Raiders of the Lost...
