i have the 18-28 Tokina that I use on my D750 and love it. It is sharp as a tack.
I have the 11-16 Tokina DX that I used on my D7100 when I was shooting it as my main camera. I bought it to shoot indoors in a old factory. That is all I thought I would use it for and soon discovered that I was using it outdoors and indoors. When I got the D750 the first lens I bought was the Tokina 16-28