This is an affordable option for the Fuji 16mm f1.4. I sold my 16/1.4 because it couldn’t compete with the cheaper and more portable 18mm f2. And after the 16mm f2.8 was released there was no way I could justify the money just to get that f1.4 aperture.
Enter the Viltrox 13mm f1.4. It might not be as sharp (my guess), but its wider and less than half the price. Perfect for a specialized lens that in my case wouldn’t get much use.