10 out of 10 points and recommendedTerrific value for full frame when Nikon 14-24 is out of your budget...To be honest none really..
If you have recently move to digital full frame ( Nikon d610 in my case), it won"t be long before you want to take advantage of the extra wide angle capability over cropped sensors.reviewed September 30th, 2014 (purchased for $257)
If like me you can't really justify the 14-24, this has prove to be a worthy substitute. I find it sharp well balanced on the camera with good colour rendition. It stacks up well with the more expensive f2.8's I have for image quality.
I would definitely recommend this lens to anyone - I won't be letting this one go..total bargain in my opinion.