Will warp images so either that is acceptable or need software to help correct the edges.

I have found my photos to be sharp edge to edge and color to be as good as my Nikkor lens and very much recommend this lens for those looking for a low price wide angle

I've seen some people complain about some Samyang and Rokinon 14mm lenses being soft on the edges (and my friend has the 14mm Rokinon that does have soft edges), but I have no issues with mine

This thing is tack sharp and clear edge to edge.

It has great edge-to-edge "sharpness," as teh intarwebz like to say - great resolution.

The far left edge is noticeably softer than the far right edge (or perhaps the far right of this lens is just incredibly sharp)

My copy was consistently very soft on the left edge (about the left 15-20% of the image) at all apertures, but was sharp on across to the right edge