Google Now on iOS is identical to Google Now on Android. Both are downloadable apps and show the same info. Google Launcher adds Google Now/Search into the launcher, but even then you still have to download both apps to get the functionality.
Google Camera is also a downloadable app and incorporates PhotoSphere within the app. Google provides the same PhotoSphere camera as an app on iOS. Google Camera is not part of stock Android
You do realize that Google has essentially stripped every core app from within Android and made them individual apps, right? These same core apps are available on iOS. There is no advantage for Android here.
There's one advantage that's more device specific but still only on Android. That's using the always listening "Okay Google" feature. On iOS it's currently only available within the app.