I see most PhD students in business management with Windows computers. There Macs have 5%-10% incidence rate in my experience. I work with a few CS profs and their students and all the profs use Macs and their students use either Windows or Linux (I think) machines :) I spoke with two of them who use new MBPs before buying mine and they strongly recommended buying it.

In some executive teaching in Europe I have seen people using mostly Macs. It could be because of the industry where they came from. Among the masters students in France, about 50%-60% had Macs.

The caveat remains: This is "anecdata"