Yesterday I went and bought a Samyang 14mm 2.8, seeing as I could do with an Ultra Wide Angle lens. It’s a manual focus lens, which should not be a problem since I am planning to use it mainly for videos.
The Samyang on my 5d3.
So far, having used it quite extensively during a shoot yesterday, it is a great buy. Very easy to use, just set it to f/8, focus about half a meter, and shoot. The “moustache” distortion that I read a lot about is not so bad, and I don’t notice it in my videos and stuff.
Maybe my next purchase would be the 85mm. Whether it will be a Samyang, Sigma, or maybe even Canon L, remains to be seen.