In one paragraph you say they don't compete, and then in the next say N800 users can "migrate to the iPhone". That means they're competing. You may think the competition is so utterly in favour of the iPhone to be not worth discussion, but that's not what we're discussing. Your argument adds weight to the initial point that Nokia *can* learn lots from the iPhone and Apple, whether in terms of marketing, UI design or software polish.
If a host of N800 users suddenly migrate to the iPhone, this should tell the story about which is a better and more usable platform I would say.