I switched from Nikon to the Olympus OM system in 1979 and loved, loved, loved my OMs. Carried them on documentary/PJ assignments to 27 countries on five continents, including several weeks in Eastern Europe just three months after the Berlin Wall was breached. I also carried the OMs around much of the US on editorial assignments and book projects plus using them for a ton of commercial work. The OM2n was my workhorse body and I still consider it the best of the OMs.
By 1992, aging eyes made it more difficult to focus quickly and accurately on the grid screens with very fine microprisms that I had installed in all my bodies. In retrospect, I should have just changed screens and kept on using the OMs. But I switched to Canon, and eventually switched over to Canon digital, which I still use for my commercial and architectural work.
When I first began using Olympus, I bought a 21mm f3.5, a 28f2.8, a 35-70f3.6, a 50f1.8, an 85f2, and a 135 f2.8. I later decided that the 24f2.8 could do the work of both the 21 and the 28, so they went on the shelf. I bought and sold other lenses over time, and on my last trip abroad I carried the 24, a 35f2, the 85f2, and the 180f2.8. This seemed to be about the perfect set of lenses for the kind of work I did. All were very sharp, and with the exception of the 180, were all quite small and light.
Now I'm back in the game with an OM2sp and an OM2n (which will need a CLA before I can use it).