Especially the wide-angle lenses (like the 21mm f/2.0 here) are particularly excellent
In an old interview with Maitani-san himself that I read somewhere, any of the F2.0 Zuiko lenses are particularly good. He used to use them himself FWIW. I have the 35mm F2.0 and 85mm F2.0 and I can agree that they are very good indeed. Especially the 35mm - which one can find quite easily and at reasonable prices as well. Not so with the wider ones.