That's correct, there is no barrel distortion to resolve. The lens is far superior to the 35mm. The only distortion is what would naturally happen when using a wide lens, ie, forced perspective etc. I shoot automobiles and architecture and use the lens with both subjects especially when shooting interiors (both cars and structures). Previously I would use the 24mm fisheye and correct the distortion with Image Align (which is going away), the resulting images were adequate but not spectacular (quality wise). The 28 is spectacularly sharp, well, maybe a touch softer on the edges but not much at all. Tomorrow I'll post some recent images.