I haven't bought it. I gave up on zooms at the wide end and currently use a Samyang 14mm 2.8 FE when I need to go ultra wide and the Sam 18mm 2.8 FE for most walk around shooting. I originally was just going to stick with the 18mm, but I came across a cheap copy of the 14mm 2.8 which was too good to pass up. I also owned the Tamron 28-75mm 2.8 awhile back, but that lens didn't really do anything for me, so I sold it.And how has the Tamron 17-28 worked out for you - optically and focal-range-wise? I ask because I have the Sony 16-35 f/4 and I am thinking about making the swap.