If you don’t need the extra speed of the 17-35/2,8 this is a good purchase.
It is quite sharp and don’t flare easily, even shooting into the sun. Obviously you have to keep the front lens religiously clean to avoid the ghosts.
In short a very good lens, without the stellar sharpness of his “rich sibling” but with a more affordable price tag too.
But I prefer the 20/2,8 or the 18/3,5 for the same usage, because they are less than half sized, and their borders are crisp like the center.
Instead with this lens for landscape work you have to stop down very well until f/8 or f/11 to make the borders as good as the center, so in my mind this lens is more suited to reportage work (but not in low light).