US wealth distribution & income equality

I got the following chart from this article, which pulls info from the October 2013 Credit Suisse report. The US has way more rich people than anywhere else. Click to enlarge.

Does this have any relation to income inequality? Let's compare with the below chart from this article, claiming the US has the highest income inequality in the developed world from this source (p.8). And which is supported by the 2013 OECD report on inequality.