It's lower by around 6-8 stops.
I've tried it. The EVFs are showing what is in essence the out-of-camera JPEG, with about 1 stop clipped from each end. And as we all know, the out-of-camera JPEG contains several stops less DR than is available in the raw data.
The out-of-camera JPEG would probably contain considerably more resolution than the EVF requires, or are you talking about something like the JPEG that gets embedded in the Raw? Could you provide more details about how you "tried" it?