Hello guys,
I decided after all to go with the 16-35 despite the x2 price. I'm not sure now the cost is justifiable but i plan to keep those lenses for a very long long time, so i consider it a long term investment. Moreover, another user helped a lot by pointing out that the bigger aperture can be helpful in lower light conditions such as indoor real estate photography which i can use.
Thank you all for the kind replies