Hello stephan.melchior
I have tested the device for a few hours (in order to be able to give a presentation with it).
My first conclusion about this part is simply COOL! As for your question about TV and films, this is basically possible (but you always have to select the HDMI input after switching on and then set the picture to full screen), but basically you can watch TV in 4K comfortably :).
The speaker in the TV is unusable (sounds like a PC speaker from the 90s), here I would really strongly recommend going directly via Swisscom Box.