Credit Suisse says otherwise when measured using Gini:

https://www.credit-suisse.com/media/assets/corporate/docs/ab...

Of course they are possible not the most trustworthy source given the recent events..

To be fair I don't know how to explain the disparity, the report even says this: "For all other countries, except the United States, the wealth shares of the top groups are expected to be understated"