I've been using 4k 2nd generation, but I can feel the performance improvement enough to feel it.

I'm really satisfied~~ It's fast and I like it~~

It's fast and the remote control is really different. The picture and sound quality seem to be better. I watch Netflix or YouTube more often on TV. The multi-point of the AirPods works well, and it's really convenient to be able to search for YouTube on the iPhone. There may be more, but I'll have to figure it out. I had doubts about its usefulness, but my doubts have completely disappeared. It's nice that the old TV is also fast. Also Apple.