generally speaking top MBAs make higher salary, however, it should be case by case. For example, I got MBA from 2nd tier MBA school, but since then I have worked for top fortune 500 company for 5+ years and I am very sucessful in my career development. Guess what? right now I am under negotiation stage with my current company as I will be sent back to China to take senior executive position with expat. package(it means your guaranteed compensation will be US$150K+).
All in all, I want to say 每个人有每个人的实际情况 and the success of your career = Degree 30% + Experience 30%+ Practical skill 30% + opportunity 10%.