In addition to the image quality results shared recently, vignetting, flare and distortion test results along with specs and measurements are now available on the Sigma 14mm f/1.8 DG HSM Art Lens page.
You already how good the image quality results are, but I expect that you will like the f/1.8 vignetting results, dislike the amount of geometric distortion and like the flare test results.
The Sigma 14mm f/1.8 DG HSM Art Lens is in stock at B&H | Amazon | Adorama.