It is the world's widest non-fisheye Leica M mount lens. Deemed impossible even as far as 10 years ago, the Laowa 9mm f/5.6 FF RL lens has been available in rangefinder coupled (not really necessary, but nice nevertheless) M mount since 2020. With a remarkable 135° angle of view and good corner-to-corner performance that even beats some of the more expensive ultra wide lenses (like Canon 11-24), the Laowa 9mm is the "as wide as it gets" bragging rights trophy for all UWA show-offs, lovers and enthusiasts, sporting 12cm/4.72 inches close focusing distance (which many men will find familiar for some reason).
The lens was briefly mentioned on LUF. I am in the process of thoroughly testing the lens - a silver version of course to match my M collection - and will share ASAP.