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From the reports I read when deciding what to buy the Sigma performs similarly to the Nikon equivalent and I've certainly got no complaints with the image quality.
regardless of what brand the lense is, always go for a fixed focal length i.e 10mm OR 20mm.
Unless paying higher end prices on a zoom WA you will 9 times out of 10 get poor edge to edge sharpness and lots of Chromatic aberation.( purple hazing around the edges)