I can't think of a hot app that came out on Android first, or even both at the same time. It's a fact that devs go iOS first, then Android. And with everybody busy with iOS8, I don't expect them to get to Android L anytime soon. When I was on Android, I've seen many apps using older UI elements than iOS (ie. Zite), then eventually got the updated UI that iOS had. Then I saw other apps that we're stated as "coming soon" or "we're working on it (ie VSCOCam). Then there were other apps that were completely half assed (ie 1Password, which was just some kind of a viewer; Everpix, which was just some kind of uploader). I've seen apps get major new features and UI updates first on iOS, then eventaully trickeled down to Android (ie. Evernote).
That's just my experience with Android.
I hear more devs talk about the App Store more than the Play Store. Android apps seem like an afterthought after they polish the iOS version.