The Gen4 apple tv will work on your TV. Your tv will upscale a 1080p picture to 4k but it wont add extra detail thats in a 4k picture.
I found HDR made just as much an improvement as moving to 4k. The ATV 4K does HDR. The 4th gen box doesnt. If you have the money then Id recommend getting the ATV 4K as you should notice a huge difference watching 4K HDR content. Just make sure you get a hdmi cable capable too. You may just have a 1080p capable cable now. The ATV 4K does have a cable test, so It will tell you if it's capable of passing 4K HDR (incl. Dolby Vision). I went for a 8k certified cable from Amazon just to future proof me at little extra cost.
no doesn’t add more detail on non4k content. If it doesn’t have it it can’t make it up. As an example a 4k picture might show a pimple on a newscaster. A 1080p picture may not. If you increase the size of the picture from 1080p to 4k it can’t then decide to add a pimple to it. Not the best reason to get 4k, to see pimples, but you get the idea.
The upscaling from 1080p to 4k can actually create a much sharper picture than just a 1080p so you may be please with the improvement with your current box.
The difference between that and 4k hdr is huge though. Mrs and I were watching a 4k hdr version of Gardians of the galaxy 2 at the weekend. The wife said to me it’s like we’re there with them! It’s that good at times. some films are better than others. 4k discs are better than streaming but the 4k hdr content on Apple and Netflix can look really special
If you update to the latest firmware of the TV upon arrival, it has newly released Apple TV app on the TV, as well as all the other usual apps you would need so you will probably find that you can repurpose the Apple TV to a different room
If you update to the latest firmware of the TV upon arrival, it has newly released Apple TV app on the TV, as well as all the other usual apps you would need so you will probably find that you can repurpose the Apple TV to a different room ☺