I'm sorry, Cupertino, but Microsoft has nailed it. Windows Phone 7 feels like an iPhone from the future. The UI has the simplicity and elegance of Apple's industrial design, while the iPhone's UI still feels like a colorized Palm Pilot.
That doesn't mean that the Windows Phone 7's user experience would be better than Apple's. The two user interface concepts—data-centric vs function-centric—are very different, and the former is quite a radical departure from what people are used to.