Worse battery life with KK topic

Worst fears realised.

The Kit Kat update has delivered drastically worse battery life.

Could often work with 10% per 45 min - 1 hr screen time before on WIFI, that has now gone out of the window.

1 hr 44 min screen time with 68% left now.

That is quite a bit worse I would say.

Anyone else feel the same?

I would rollback, but the camera improvements are just so much better.

Different displays between D820 and D821 (worse) topic

I had a D820 from the US Play store and I just bought a new D821 from the Carphone warehouse in the UK because I wanted to use the 4G.

The displays of both models look similar but the display on the D821 is a little bit "sticky".
For example, It's hard to swipe for notifications and hard to swipe in Swiftkey. My finger feels very hard resistance.
On the D820 it's much better (actually, I like it very much there). I also compared it to other phones.

Do you also see this on your D821 or I might have a defected unit?