Photons on Photos is quickly becoming the best source for camera dynamic range performance information and they just listed their preliminary measurements for the Olympus OM-D EM-10 Mark III and it’s a mild improvement over the original. Their preliminary results tend to be a bit conservative and I will post the final results when they are available, but for now, this is about what you should expect. Most micro four thirds cameras hover around the same range, including the flagship OM-D E-M1 Mark II. You can manipulate the results for yourself here.
Olympus OM-D E-M10 Mark III Mirrorless Body – Black
B&H Photo / Amazon / Adorama
Olympus OM-D E-M10 Mark III Mirrorless Camera w/14-42 – Black
B&H Photo / Amazon / Adorama