For me personally (had the same dilemma earlier this year

)
1st choice definitely CZ 16-80 (sharpness, IQ, colour, range)

Price not so nice
2nd choice Sigma 17-70mm f/2.8-4.5 Macro DC (damn interesting lens, nice range, 20cm MFD, macro magnification 1:2.3@70mm, sharpness also okay). to me offers most value for my money. Eventually I went with this lens

But this is one lens that is very hard to sell 2nd hand
3rd choice tied Tamron and SAL16105. Tamron is sharper than the sigma, constant aperture, range not so nice (again, a personal observation). I personally love the SAL16105's range, it's simply awesome!
Some people might not agree with me.

The choice ultimately is up to you, we give you the information to enable you to make an informed decision. Cheers!

i saw another forum mention that not so advice to take this lens if owning the 18-70 kit lens ?