The new Sigma 14-24mm f/2.8 DG DN Art Lens for Sony E-mount now already released, the US price for this lens is $1,399, currently in stock at B&H Photo Video/Adorama/Amazon. dpreview has posted the sample images of Sigma 14-24mm f/2.8 DG DN Art Lens.
According to dpreview, these sample images are tested on Sony a7R IV and a7R III, they are impressive sharpness. You can take a look at full sample images here.