Picked this up off Gum Tree earlier this week and managed to have a play with it last night. One of my jobs this afternoon is trying to figure out how to take a reasonable flat frame! Ultra Wide Angle and even illumination I think is going to be a bit of a headache. Maybe get some darks tonight to help with some contrast.
Optically... It's soft. However compared to most of the lens' in this range (except the Nikon 14-24mm), they're all pretty soft and have reasonable distortion and other optical aberrations.
Am I happy with it? For the price point it certainly does the job. I think I'll end up using it with my Nikon D700 (it is VERY forgiving on lens') for super wide field. 3.91 micron pixels + no anti-aliasing filter isn't the best lens for a $350 SWA 14mm lens
30x300s with Nikon D7200 & Samyang 14mm F/2.8 @ F/5.6