I have uploaded samples from a test I had the opportunity to shoot yesterday. Out of camera jpgs, type layer added for labels, resaved as jpg. Three scenes, each shot with 14mm/f2.8, 16mm/f1.4, 16mm/f2.8, all shot at f7.1, ISO200. I’ve tried to place easily identifiable and comparable elements on sides of the image, e.g. utility poles or edge of cement slab the bench sits on. Certainly appears that the 16/2.8 is indeed wider than the 16/1.4. I maintained out of camera pixel dimensions, so feel free to download and pixel peep to your hearts’ content. I created a Google Photos album here: