I have tested this lens in wide landscape and portrait situations and have found it to be sharper than the Nikon 18-135mm.
I am not here to bash the Nikon, but I can see a difference between the two, but note that in order to have this Sigma at it's best, your camera should be set to +1 contrast at least (D40), and this lens is definitely sharper at f/4 and above. It is a bit soft at f/2.8, but when you increase your contrast and sharpening (in camera), it's not that significant, and is easily tolerable.
For portraits, it is brilliant. I am glad I made the switch from the Nikon. You'll be amazed at it's landscape quality as well.
Two thumbs up for Sigma!
Sigma 17-70mm f/2.8-4.5 DC HSM Macro Lens for Nikon DSLR
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on Sunday, November 23, 2014
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