I am looking for a 24-70mm f2.8 lens for general use and low light gig/concert photography.
The 2 I am looking at are:
Canon EF 24-70mm f/2.8 L USM Lens
Sigma 24-70mm F2.8 IF EX DG HSM Zoom Lens
The Canon is almost twice the price of the Sigma. Is it worth paying for for the Canon? Which lens is best