I bought a Tokina 16-28mm f2.8 FX lens a few days ago. Of course I had to try this one quickly on my Nikon D600. Rather heavy equipment, but I do like the results very much. However this lens shows some issues with rainbow like flares around very bright highlights (see the last image for instance).
I swapped this lens for a Nikon 20mm f1.8 now. I prefer the low weight of this lens over the zoom facility of the Tokina. I also own an Irix 15 mm F2.4 manual focus lens that is less heavy than the Tokina. Both of these prime lenses do not have the flare issues :-)
"Koopgoot" - Rotterdam
Loempia's - Rotterdam
Markthal - Rotterdam
Old Town Hall - Gouda
Market square just before "Pakjes avond" - Gouda