What could be written here? To tell you the truth I would recommend even the previous version of the Samyang 2.8/14 without scruple. The improved model, although a bit more expensive, has really much more to offer.
decent build quality,, sensational image quality in the frame centre,, very good image quality at the edge of an APS-C/DX sensor,, fully acceptable image resolution at the edge of full frame,, chromatic aberration medium at most,, well-corrected coma,, properly corrected vignetting on a small...
high and complicated distortion,, significant vignetting on full frame,, you can’t use any filters.