Hi TS,

Why not combine your 2 thread in 1? hmm... I would I choose 17-50mm without VC, is sharper and constant 2.8+cheaper

hmmm I never use sigma before but my friend using it and I using 27-75 tamron. He mentioned that auto focus is faster than tamron however the sharpness and color, the tammy win hand down but I hate tamron for the AF point when I worked for event in low light. But that all is history when I still in dark side(Nikon). Now I am Canon but I don't buy third party lens for 1 reason. The QC is not as good as canon espcially backfocus problem. Why u never consider few another lens like 15-85 canon, 17-50 canon L, etc that almost same price. I using 17-40L before, it a great lens and 2nd hnd value might drop below 1.7k Seriously... Weather sealed summore..