Question for Apple Watch wearers: is Siri on the Apple Watch the exact same as Siri on the iPhone?

I ask, because it's not the case with the one on Android Wear - the watch version can't answer factoid-style questions ("What's the tallest building in Dayton, Ohio?"), can't identify songs, can't perform simple system commands ("Increase scree brightness"), etc.

It's still convenient and useful, but it's just not as good as I had expected.

I'm due for a phone upgrade sometime soon and starting to seriously think about switching from Android to iOS.

Update: it looks like phone version has regressed and can't identify songs any more :(