New Sigma 17-70mm F/2.8-4 vs Nikon 18-105mm F/3.5-5.6 - Nikon Lenses Discussions on Nikon Rumors For
If it comes to quality issues, Nikon is not flawless, I'd say. But as I don't know any of the lenses in question - I just bought the 16-85 and it's nice, but the 17-50/2.8 from Sigma was better in my eyes and sometimes a wider aperture does matter - but t...