Really loving the 2 Olympus zooms I got, the 14-35 and 35-100 f2.
Probably the only other wide angle with the same optical class is the Nikon 14-24, but it is a stop dimmer than the 14-35.
And if you want to go even wider, the Olympus 7-14/4 is similarly superb glass. And communicates with the mount now, not in six months time.