This is a lens that I'm also very interested in. It seems a very natural field for Samyang to compete in with their manual focus only philosophy. I have a lot of experience with manual lenses as I like to play with old M42 lenses at times. I've never found a great M42 wide angle though, and the truth of the matter is that I'm often less than thrilled with my 17-40L in the corners. If this lens was sharp corner to corner it could be a great lens for landscape and architecture.