I had a similar experience with my first version of the 10-24mm f/4 lens. I saw ‘smearing’ at the edges. Others who I knew and had the X-T5 told me that the second version, with weather sealing, performed better with their X-T5 than the original. I purchased the newer version. Although it is not perfect, it is much better at the edges and corners. I am fine with it’s performance for the vast majority of my images but if I have an image where very important detail is on the edge of the frame, I’ll run the raw file through either DXO or Topaz Sharpen AI to improve the edges. A couple of weeks ago, I published a post on my blog with my assessment and provided some example images. If you care to read it, it can be found here: https://www.thewanderinglensman.com/2023/01/follow-up-on-fujifilm-xf-10-24mm-lens.html. I hope this might help you a little.