Fixed the link. I am not an expert on wealth inequality so I have to trust some who are. I trust this website because it was trusted by the 'good council for redistribution' in Austria. A council that redistributed the inheritance of an austrian millionaires heiress under the advice of experts. Calculating wealth distribution is hard though so I am not surprised you found different graphs. That is why even a 0% wealth tax would be good just so we could get a clear picture of where we stand.