Xperia Z1 display

This is a video comparison between the Xperia Z1 and the Xperia Z Ultra(it's in German but the important part is the display comparison, at around the 56 second mark): http://www.youtube.com/watch?v=8tNhtTZ2X5E

Why.

Why did Sony take a step backward with this display? It's Triluminous sure and still better than the Z, but it isn't as good as the Z Ultra like i hoped. Sony used an IPS display for the Z Ultra, but for their *flagship* device their back to non-IPS TFT. Why? Are they just cheaping out?

Unbelievable. I don't care that much about viewin angles but if they really want to improve their market position they're gonna have to stop this trend and just use IPS like everyone else.