I think this current onslaught of WP (with Cortana) vs iPhone (w/ Siri) is great. If you look at the current smartphone landscape, iOS is playing catch-up and is basically stagnant. Even with iOS 8 it's main features are available already in WP, Android or both. When you are the up and comer, there's no reason to take on the biggest player, but instead go after the weaker player. I can't wait to see the 830 commercials, "Oh hi Siri, you have a new look. So do I. How much did your new outfit cost you? Really? Mine only cost $X. You must have a great camera, oh, only 8MP..." Personally, I think it's prime time for people to have OS fatigue with iOS and are going to be looking for something different and the more MS can pick off before they jump to Android the better.