Bryan's outstanding ISO crops now make it 4 different web sites that have shown the Sigma to have remarkable image quality.

DXOMark, Lenstip,and SLRGear all previously gave it very high marks, and now Bryan's post confirms it.

Bryan's ISO crops:
Canon 17-55 on 60D vs Sigma 18-35: Sigma even at f/1.8 beats the Canon at f/2.8 at every focal length except 35, and at 35 beats it by f/2.
17 TS on 60D vs 18-35 Sigma at 18: Sigma wins at f/1.8 vs TS at f/4
24 f/1.4 L II on 60D vs 18-35 Sigma at 24: Sigma wins at f/2 vs f/2 at each location in the frame
28 f/2.8 IS was not tested on 60D and there are no other worthy competitors at that focal length
35 f/1.4 L on 60D vs 18-35 Sigma at 35: Sigma wins at f/2 vs f/2 at each location in the frame

Despite all of that I'm not seeing much of a buzz anywhere about the 18-35. I'm curious why? Has anyone who would have bought this lens already gone full frame?

Performance seems off the charts and I haven't seen any objectionable bokeh,etc... posted.

I've seen posts that the 18-35 at 35mm even works on full frame without too bad vignetting. I'm curious if the same is true at 28mm or if the vignetting is a big problem here.

Dave