Check out http://www.activevfp.com/dev/qa.asp - at the bottom, it directly compares VFP 7 to VB, C++, and Access. Here it is in a nutshell:

"Why would I build a component in Visual FoxPro when I can build the same component in Microsoft Visual Basic® or Microsoft Visual C++®?

Visual FoxPro components are extremely fast, thanks to the data-centric language of Visual FoxPro and its ability to quickly retrieve and manipulate data. Further, Visual FoxPro can build character strings very swiftly. A Visual FoxPro component that works with data and returns HTML will, therefore, be very fast.
Visual FoxPro also has object-oriented programming capabilities, including inheritance. This provides a high degree of reuse across applications. A Visual FoxPro developer can create a set of classes that includes the core functionality of a Web database component, so that code will not need to be rewritten each time a component is needed in a Web application. The developer can simply create a component that inherits the base functionality, and then add application-specific code to it.
Finally, building COM components in Visual FoxPro is an excellent way to reuse existing code. Code that is already written and tested can be built into a component, rather than being recreated in another language."

"How do you position Visual FoxPro in relation to Microsoft Access?

Microsoft Access, the database in Office, is the most broadly used and easiest-to-learn database tool that Microsoft offers. If you are new to databases, if you are building applications that take advantage of Office, or if you want an interactive product with plenty of convenience, then choose Access. Visual FoxPro is a powerful rapid application development (RAD) tool for creating relational database applications. If you are a database developer who builds applications for a living and you want ultimate speed and power, then choose Visual FoxPro."

As to .Net, you can easily combine your existing VFP code with .NET. Also, you can do most of what you can do in .NET in VFP. IMO, .NET was developed to address the deficiencies in VB,VC++, and ASP, not VFP ...
>Hi ALL,
>
> I have to prepare an article in the topic Advantages of VFP7 Over VB,
>.NET and other Languages. Please help me out.
>
>Regards
>
>HARIHARAN RAMACHANDRAN