I upgraded from the E-M1 iii to the OM-1 ii a few months ago. I find it to be a big and worthwhile improvement, for my interests. Among many other things, image quality and low light performance (noise) are noticeably better, the image finder is brighter and clearer, it is quicker to focus, and its ai focusing capabilities on some subjects are quite astounding. It can pick out a bird's eye to focus on pretty routinely, even when the bird is in a clutter of branches. I'm very happy with it.