Really a great lens. I sold my Tamron 28-75 G2 for it.
I prefer wider than 28mm rather than F/2.8, but the Tamron was also very good.
Couldn't be happier with the 20-70G lens. Very sharp, well built, and the 20mm wide end is really nice! If I need to go wider, the Sigma 14-24 F/2.8 goes on my camera and I'm all set!