I personally think that Nokia don't know how to market this phone. It is kind of limited edition phone where even U.S. don't have it (a place where the phone has HUGE sales potential). Before it comes out, Nokia spoiled its reputation.
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Didn't read/follow the history of SIRI, but comparing with other Chat Bot available, it's consider more serious type. Actually, I'm not referring to voice recognition, but the AI logic to response based on the input given. The voice recognition I suppose it's job is to translate the input accurately (e.g. when you say weather, it should accurately translate it as "weather"); As for the accuracy, I believe it the logic maybe more complicated as in it doesn't just make up word by word, if you make a sentence, even some word in the sentence it may translate wrongly, but the AI logic should be able to make it into a more logical word that make sense, so probably that's why it's able to be more accurate.