I bought the tamron several months back and I definitely enjoy and appreciate the lens. The beast is what i truly want but that wont happen any time soon. Now I have been reading about the Nikon 35-70 f/2.8 and am wondering if the IQ/sharpness is significantly better than the Tamron. The limited focal lenth range would be fine for me, i believe. I am now considering selling my Tamron and getting the Nikon. What do you guys think? Worth the swap? Just keep the Tamron?