Like the Sony FE 28mm f/2 Lens, the Sony FE 24-70mm f/4 ZA OSS Lens has strong geometric distortion and current Sony cameras have the distortion correction menu option grayed-out. Distortion correction is always enabled when this lens is mounted and this means that the corrected image is seen in the electronic viewfinder and we are not able to determine the required precise test chart framing for the uncorrected view. So, understand that the image quality results for the Sony FE 28mm f/2 Lens include distortion correction and that this lens has strong distortion at the longer and shorter focal lengths.
Here are some comparisons to get you started:
Sony FE 24-70mm f/4 ZA OSS compared to Sony FE 24-70mm f/2.8 GM Lens
Sony FE 24-70mm f/4 ZA OSS compared to Sony FE 24-105mm f/4 G OSS Lens
Sony FE 24-70mm f/4 ZA OSS compared to Canon EF 24-70mm f/4L IS USM Lens