On your image
http://www.tmssoftware.com/site/img/chart_collection_large.png donut is draw with anti-alias. In my application it is see follow: http://translateit.ru/download/donut.png.
How to turn on anti-alias ?
On your image
Are you using the TAdvChartView or the TAdvGDIPChartView ?
I am using TAdvGDIPChartView
So, what about my question?
Do you select a TrueType font?
I talk not about captions. I talk about lines and circles.