Since this is another wide angle option for K-mount (supposed at a good price), it should be of interest to some here.
https://www.ephotozine.com/article/irix-11mm-f-4-firefly-review-30678#Performance
Summary :
"What an exciting lens the Irix 11mm f/4 Firefly is. It opens up a whole new world of creative possibilities in a well-made, well-designed package that delivers the image quality. It will not be for everybody, perhaps because of the ultra-wide style of the images, or maybe because of difficulties using the manual focus system, but if the lens appeals to the individual photographer's creativity then it will be a rewarding experience."
Of course being Pentaxians, manual focus difficulties are irrelevant.
https://www.ephotozine.com/article/irix-11mm-f-4-firefly-review-30678#Performance
Summary :
"What an exciting lens the Irix 11mm f/4 Firefly is. It opens up a whole new world of creative possibilities in a well-made, well-designed package that delivers the image quality. It will not be for everybody, perhaps because of the ultra-wide style of the images, or maybe because of difficulties using the manual focus system, but if the lens appeals to the individual photographer's creativity then it will be a rewarding experience."
Of course being Pentaxians, manual focus difficulties are irrelevant.