Bill Claff has been publishing authoritative, alternate dynamic range charts for a while now. The Olympus high resolution results (HR, hand-held HR, and with computational ND filter) are shown at
https://www.photonstophotos.net/Charts/PDR_HighResShotMode.htm PDR
Olympus OM-D E-M1X 9.72
Olympus OM-D E-M1X(HR) 11.65
Olympus OM-D E-M1X(HHHR) 11.54
Olympus System OM-1 9.54
Olympus System OM-1(HR) 11.53
Olympus System OM-1(LND64) 12.01
For comparison, the chart for all brands is at
https://www.photonstophotos.net/Charts/PDR.htm For example, the Nikon Z9 gives
Nikon Z 9 11.30
Nikon Z 9(DX) 10.49