You want something like the $2,000 Nikon 14-24, and wonder why you can't have it for $700?
never said that, where did you read that?
Your OP
"i compared the images to my uncles images and his 14-24mm nikkor lens is much better.
the nikkor is sharper and has less distortions.
so i thought i buy the EF 24mm f2.8 IS.
it´s a prime and i expect better image quality then the zooms, right?
"
You appear to be asking if a low cost prime is going to be as good as a $2,000 lens.
the nikkor zoom cost 1500 euro, i asked for a prime for around 800 euro.
the nikkor was an example and i compared it to the canon zooms i have tested (24-105mm = 900 euro).
so you say it´s absolutley ridiculous what i ask for? i don´t think so.
there is a 90 euro prime lens from canon that prove me right.

primes are much cheaper to build, easier to design and should have better image quality. (*)
in the end the engineers can focus all their efforts on just one focal lenght.
the 150 euro 40mm f2.8 pancake is no slouch either.
(*) of course you can´t compare old FD or EF primes from the late 80 or early 90 with todays zooms. technology does not stand still.
and i like to say beforehand, i know zeiss primes are more expensive.
That hasn't been the case for ages. The 16-35 II, for example, stomps all over all the non-L primes in the same focal length range (though I don't know about the new IS ones). The new 24-70 even gives the TS-E 24 II a run for its money. The new 70-200 eats (almost) all the primes in that range for lunch. The 5-15 is the best fisheye ever made. And so on....
you compare 20 year old lenses like the 50mm f1.4, 20mm f/2.8 or EF 28mm f/1.8 to relatively new ones are you?

but i asked about a very new prime lens... the EF 24mm f2.8 IS.
so no, im not under the impression every old prime is better than new lenses with better designs, coatings etc.

but i think the 24mm f2.8 IS is maybe pretty close?
i mean it´s a new design.
The new 24-70 even gives the TS-E 24 II a run for its money.
well not in terms of distortion.
yes you can fix that in post, as you can fix CA´s in post.
but let us talk about pure lens performance here.