+1 for me on the Tamron. It's just right for general and wedding. I've just ordered it as my walk-around lens, and my 24-70L will retire after its arrival.


I have owned the Canon as my first DSLR lens, it's certainly not as good for wedding, it's very slow comparing to a f2.8. The distortion is visible at 17mm.


I don't know too much about the Sigma, but overall I would like to believe that the Tamron will be right for what you do.


My $0.2.