Questions about Apple TV 4K (3. Gen)

Only the 128GB version has a hub for Apple Home and an Ethernet connection.

Yes should work

Yes, of course, the new A15 chip is much faster, k smaller, has no more fans and the metal remote control is of better quality and can now also be charged with USB-C. But: you shouldn't buy the 64 GB model, it's quite a bad buy, because for only about 6 francs more you get double the memory, the Gbit Ethernet connection and the Thread chip, with which you can also do home automation at some point, if you want to, and the resale value of the Apple TV 2022 without these things is zero. I wouldn't buy one of those. I only recommend this model with 128GB of storage: Apple TV 4K 128GB (3rd Gen) (Apple Siri)

and Sky is also available?

Yes, you can receive Netflix with the Apple TV 4K (3rd gen.). This device supports Netflix in Ultra HD, including Dolby Vision and HDR10, provided you have a corresponding Netflix pan and a compatible internet connection.

I can't answer that, I'm with a different supplier.

Yes, it works perfectly, there is the Blue TV app, log in as usual with the MySwisscom account and use it like the TV Box.

Yes, and a subscription to Apple TV+.