There are obviously a lot of differences, as Vim's syntax highlighting is a bit more flexible (and a bit more limited in other manners) than Visual Studio's, but it's not bad overall and I've been pretty happy with it. some difference, though, are intentional, like a slightly darker background color or line numbers.
Here's a screenshot of looking at XML in VS:
Here's a screenshot of looking at code:
Update: Download the Visual Studio 2008 version here.