I have been using the Tamron 24-70 f2.8 VC on Canon 6d and Canon 5dmk3 for 2-3 years. I use it mostly on events such as weddings and business functions, as well as portrait sessions. I compare it against the Canon 24-70 f2.8 mk2, and found its image quality and sharpness to be very close. I can not justify spending an extra 800 on the Canon when the Tamron meets 90% of my needs. The focusing is fast and silent. The VC (image stabilization) works with slow shutter speed. I don't shoot in extreme conditions so I can't comment on how weather resistant it is. I would highly recommend this lense, unless you care for the red ring on canon lenses.
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