Galaxy S4 - No Update to Lollipop found

I have a Galaxy S4, which I got with KitKat 4.4.4 installed. I've never unlocked or rooted the phone:

 http://i.imgur.com/5G1xX5P.png

When checking for an update OTA, It says my software is up to date:

 http://i.imgur.com/CD2da57.png

And Samsung Kies 3 says my firmware is the latest:

 http://i.imgur.com/lbXIpiZ.png

What's going on? How can I update to Lollipop?

Thanks for any help.