That is the extra cost when buying a new D7200 with it included.
I currently have a Sigma 17-70, but it's not very sharp at 17mm, even when stepped down a bit. Wondering if I could expect better results out of the Nikon 18-140, plus the extra reach might come in handy sometimes.
Thanks.
Never had sigma lens but the Nikon lens most likely will have quicker AF, better subject tracking, focus ring does not move while focusing.
I do not think it would be major upgrade from your sigma.
16-80 would be.
No, the 16-80mm is a very controversial and expensive lens. I personally wouldn't own it.
The 18-140mm is far superior to the 16-80mm in terms of autofocus speed and accuracy and doesn't have any notable issues with color fringing. For $300 it's a steal. For $1,100, the 16-80mm is a very poor value.
http://www.lenstip.com/index.php?test=obiektywu&test_ob=458
http://www.lenstip.com/399.1-Lens_review-Nikon_Nikkor_AF-S_DX_18-140_mm_f_3.5-5.6G_ED_VR.html
I don't know which 17-70mm Sigma that you have, as there's been 3 generations? As I recollect, all three have been well regarded and the current "Contemporary" is a fine lens.
I personally enjoy the near macro capabilities of the 18-140mm at the long end and it's usable wide open at any focal length. It's a great lens and probably the best of its kind. However, it all depends on how much you need the $300.