Recent Samsungs had this first...
Anyway, I don't think WP really competes with Android or iOS flagships on any hardware-to-hardware basis. Either you want the simplified OS experience or not. If you do, the handsets themselves are good enough, but that's not going to decide it for anyone.
What was the first Samsung phone to have it? Nokia Lumias have worked with regular gloves since the Lumia 920, if not earlier.
And Microsoft isn't hugely behind on hardware anymore, but they don't iterate as fast as all the Android manufacturers. Apple and the Android manufacturers leapfrog each other all the time and Windows Phone usually keeps a 6 month pace behind Android. But since Windows Phone is fairly optimized somewhere between iOS and Android in terms of how much hardware needs to be supported, it runs pretty smoothly on a generation behind.
Mobile hardware has reached a level of maturity now that you aren't seeing a massive level of new functionality from one generation to the next, even going to a new process node. The Galaxy S6 and iPhone 6 aren't shooting magical sparkly rainbows out of their screens, it's really just fingerprint sensors and modest increases in batter life and paper specs.
I use Android and iOS on a daily basis, so it's not like I'm blind to their advantages, but it's really the headstart in apps that is keeping Windows at a distant third. Specs still matter to us geeks, but the dominant complaint about Windows Phone is that there aren't any apps for it because no one is using it. It's the chicken-and-egg app development problem that's usually two step forwards, one step back, that has been plaguing the OS since before Mango on WP7.
I think Windows 10 is going to bring greater success and grow the platform, but loyal WP users are going to have to exercise some patience.
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