I find
Tamron 28-75 f/2.8 very dependable and I would use it again for wedding.
Though it is not as wide as 16mm, but the range is very useful to cover the wedding, portraits, candid, and close up. It has in between 1:3 to 1:4 close up magnification. I would prefer this lens as a single lens when compared to 16-50 or other variants. Its strength is on its sharpness, very reasonable bokeh and it is quite sharp in my books for wide open shots. I pretend to be a wedding photog in my friends' wedding using
Tamron 28-75mm f/2.8 along with
Komine 135mm f/2.8 1:2 Macro &
Pentax FA 50mm f/1.4
The good copy of DA* 16-50 would be a better lens. But if I have to pick one lens to cover a broader range, I would pick the Tamron zoom again. If your emphasis is on group shot versus portraits, then I would pick the DA* 16-50 over the Tamron.
Thanks,
Hin