An earlier post on "Making a business case for MVC" provided some details about how a developer or architect can promote ASP.NET MVC framework based on features such as Facilitation of Modern Web Experience, Quicker Turn Around for Enhancement Requests, Enhanced Security Features, Performance & Scalability, Compliance, Test Driven Development Support and Reusability.
Following is comparison of ASP.NET MVC features and how the framework has matured over the years.
The table above shows categorically how MVC framework has enhanced existing features, and added new areas to support Maintenance, Markup/Code Quality, Security, Web Standards Performance, Content Management Support and Testability. I hope this helps making an upgrade case to management. Here is the PDF version of MVC framework feature enhancements.