Conclusions from DxOMark:
The Nikkor Z 24-70mm f/2.8 S sets a new benchmark by which other 24-70mm lenses will be judged.
It may not have the record for the highest sharpness score, but it manages to maintain its excellent sharpness very well across the frame. The distortion, which isn’t excessive, is also corrected automatically in RAW files and its control over chromatic aberration is superb.
The degree of vignetting is perhaps a little disappointing, but it can be addressed in post-capture processing if necessary, and many photographers like to darken image corners to enhance their images. If you want the best all-around image quality from a 24-70mm lens, the Nikon Nikkor Z 24-70mm f/2.8 S is the lens to go for.