But you get two fastest available zooms (cine or still) at 14-35mm f/2.0 and 35-100mm f/2.0 both from Olympus.
Since they only feed a small 4/3 sensor, and smaller sensors have lower performance than larger ones at the same f-stop, these 4/3 f2 lenses only perform about the same as full-frame (36x24) lenses at f4. Since f2.8 lenses are available for that format, those are the fastest zooms available, not the f2 lenses for 4/3.