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So let's start with KitKat 4.4.4 bugs.
There is still a problem with adding a photo to a contact - problem I have reported here.
This bug has been partly fixed in 4.4.4. Theres is no longer 7-10 sec waitng for starting app to crop a photo and if I choose taking a new photo everything is as should be.
Problem remains when I try to choose a photo from a photo album. Every photo is 90 degrees rotated, while cropping is still rotated and finally photo added to a contact is rotated.
This bug didn't exist in .681 firmware and previous ones.
Thank you, I'll try that as soon as i am home from work.
I've done a system-restore now, but performance is still very choppy when it comes to scroll up or down in Facebook. I think it is too in some other apps, but this could be just my imagination. This is frustrating, i wish i never had updated to this new version, because i was so happy with the performance before that.
Yes, Opera is extremly (!) choppy too, it's not only a problem with Facebook. Everything which involves scrolling up and down. 
I would try to restore to the previous version, but i don't have a clue where to get the correct firmware for Austria, for an unbranded model of the Xperia Z1 Compact..
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Did you reset the phone after the update? If not, I'd suggest that you give it a try.
When you say the battery life is worse, is this also in general and not just with Dino Hunter?
Can you do the following steps?
Reboot your phone and let it do nothing for 10 mins.
Go to Settings > Power management > Battery Usage
Which apps show on top? (If possible, provide screenshot)