Yes.

I've been playing with a g1 for quite some time (got it in september). Did a bit of development with it (nothing I'd ever release to the public, unfortunately). I did get quite a bit used to it. I had it rooted and was running android 2.2 on it, which was rather fast.

Then, I got an iphone 4 for christmas and holy shit, this is a much better experience. My only complaint about the iphone is that the bar you swipe to unlock the phone is lower than what I'm used to. Low enough that if I'm not looking at the phone, I'll still have my thumb high enough to miss the bar completely.

That's a good question, although I'm not sure it would have worked the same way for me if I had started with an Android phone. In my area, iPhones have become so popular that everywhere you look there are at least a dozen people sitting in cafes or walking down the street with them in their hands. Androids are becoming pretty common themselves, although it seems as if the audience associated with them (which is a little more tech savvy) is less likely to be showing them off in public or using them in the same places iPhone users do. As a result, unless I was a really strong advocate for Android phones or somehow despised iPhones, I think that I would eventually try and switch to the iPhone out of conformity and curiosity. Even if I was completely comfortable with the Android phone I had at the time, the peer pressure and the hype associated with the iPhone would most likely cause me to reconsider. This doesn't seem to happen as much the other way, which is probably due to the impression Android phones have on people and the fact that most iPhone users wouldn't be good Android users in the first place even if they hadn't become accustomed to the iPhone.

My first smartphone was the Nexus One. Using iPhones infuriates me, because from my perspective, the iPhone "does it wrong". There are a lot of little Android things that I know and expect, and it rubs me really raw when they aren't there. The iPhone has much prettier transitions and smoother scrolling, and that's about it, as far as I'm concerned. In literally every other way, I prefer my Nexus One. I know, intellectually, that the way the iPhone does things works (after all, other people have no issue with it), but from my perspective, it's less usable than my Android phone.

The first device you really use is naturally going to set expectations for you, and it's difficult to get past that comfort when another device does things differently. The iPhone is not a better Android phone than my Nexus one, and Siegler's Nexus S is not a better iPhone than his iPhone.