I have the 24-70 f4l which is a great lens for landscape photography, I would say the f2.8 would be excellent for portraits and weddings as the faster aperture will allow you to do more with the depth of field & work in lower light if you were indoors without raising the iso as much. a bit heavier & more expensive than the F4 but a great lens. I think you would see an improvement over your 28 - 135 plus as rob says gives you a wider lens to be more artistic with
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