Like many photographers in the Olympus / OM System world, I’m in the process of upgrading my photography gear from the E-M1III to the OM-1. Fortunately, SmallRig just started shipping a camera cage for the OM-1, since their long-unavailable cage for the E-M1II (which also fit the E-M1III) does *not* fit the OM-1. Before I sell off the old cage, I thought it might be helpful to compare the two models for anybody that may be in the market for one or the other.
At a high level, there are some key changes: some mounting points went away, or moved; the overall shape changed just slightly (in the process, access to body-front buttons is improved); and the new cage has a built-in Arca-Swiss mounting plate and captive attachment tool.