Is that all the movies and series 4K Ultra hd Netflix?

It's about 16 euro Netflix, I have a 4K TV

What I want to know is whether all films and series on Netflix in 4K Ultra HD are quali or just the latest or a few? Is that all?

No, they are not, you can't include a lot of old films that didn't have anything like 4K.

Just do the smaller subscription first, you can still upgrade