My experience with W.A. zooms is that they sometimes (depending on aperture ,distance, focus settings) exhibit a strange behaviour.I'm wondering why Canon doesn't just release a super-wide zoom at 2.8? It'd be amazing to see a 12-24 f/2.8, or better yet, 14-28 f/2.
Some parts of the pictures that should be in focus aren't, while other equidistant ones, are.
Primes are far more reliable.
But maybe this is a purely personnel experience?
Additionally: just try to compare the 11-24 or 16-35 set at 24mm with results obtained with the EF 1,4/24 or TSE 24 II ...
Or have a look at the Nikon Z 24mm.
Primes are in my subjective pixel-peeping opinion sharper.
I just hope the new Canon primes will not be comatose wide open.