There's a clear difference between the JPEG and WEBP versions. Especially on the background on the right of the man. There are clear bands of various shades of

There's a clear difference between the JPEG and WEBP versions. Especially on the background on the right of the man. There are clear bands of various shades of grey that circle out of the brighter areas behind the face and from the mid-right edge. They appear to join about two thirds from the middle to the right edge. That artifacting is most notable at full size, but is still visible on the smaller size on the web page.