The Chinese-German partnership between Kipon and IBE Optics produced the fastest lens of any digital mirrorless system, the Ibelux 40mm f/0.85. This lens will be sold this summer for around $1,000. It will be available for all current digital mirrorless cameras and that includes of course the X-mount. Don’t know if a lens fast as this is really needed. I don’t expect a great image quality at full aperture. You will have to stop down to get a decent image. The 35mm f/1.4 Fuji lens is certainly the better deal. The German IBE is also known for their video lenses and that is likely the goal of this lens, to be a fast video lens.