Would you exchange a Tamron 28-75 for a Canon 28-135? I have and like the Tamron, but always seem to be zoomed out to the 75 end. Also, I'm using it less for low-light photography since I got my 85 f/1.8 prime.
I have the opportunity to make a straight trade for the Canon, but am hesitating because when I do use the Tamron, I just love the colour and sharpness it produces. However, the 28-135 would be a much more useful walkabout range for me, and the IS is tempting.
Any thoughts?

