Well, I can only compare it to what I got. For me the question was, would I upgrade and the answer was pretty much no. Why? Because I love the podcast and feed reader and I haven't seen it on the iPhone.
Also I have picked what I know to be the smallest Smartphone around. Its not a PDA phone and the iPhone might go head to head with smartphones. I am aware of that, but the SDA packs a pretty good punch in a very small package. I am not aware of any other phone that can doo that.
I don't want to lug around a PDA and I don't like holding a PDA to my head for calls, neither do I like to walk around with a Star Trek Geek like Bluetooth headset.
So yeah, you are right. The SDA is probably not the best competitor to compare with, but if you are looking for an ultra small package, it is defenitely first choice (for me that is).
And since I am already missing features on the iPhone my even smaller SDA has, there is no question that an even more feature rich WM5 Smartphone can do even better.
BTW, I still believe the iPhone will sell like hot cakes, simply because its Apple.