I just canÂ´t see how such a lens could surpass the current 16-35, particularly considering the weak IQ (lack of contrast, sharpness and sometimes terrible halo fringing), not to mention the hefty pricetag that is normaly associated with DO.I just can't see how you are making such comments based on a lens that you haven't used.
Yes, the DO lenses traditionally have these weaknesses - but the last DO lenses released are over half a decade old, too. I wouldn't expect Canon to have all the demons totally worked out by this point, but I personally think it's encouraging that they're still trying.
If they manage to make the lens more compact (hopefully that results in a closer minimum focus, though obviously it doesn't guarantee it), if not lighter, that is reason enough for them to keep trying. One of the purposes of Canon's continued patent applications is that they prevent some other party from running with a technology like this when it's ready for prime time.