Lumia 920--The World's best Touchscreen???

The Lumia 920 has been advertised as the Worlds Best Touchscreen. Is this really true or just a marketing thing. And if it is true what technologies make it so. Does anybosy have an idea about the touchscreen. What exactly is PureMotion HD+ P.S. I know that Lumia has some technology for Deep Blacks but cannot remember the actual name The I am not able to embed a video so heres a link.