I believe that this is a perfect Use case for a pie chart because you can easily identify the percentages for each salesperson. The more information your pie chart can say the better. In this case its not enough to only know the order amount in dollars. By including the percentages for each salesperson, it makes for a more appealing pie chart.

I am not sure if there is a better way to display percentages than a pie chart. Written form can be useful for showing percentages but a pie chart looks much better.