Purists would argue that you cannot top a great single origin coffee and that you must be very careful not to destroy the greatness of a coffee by mixing it randomly with another. Yet, coffee roasters can create blends to complement and at other times to create contrasts. They may find a couple of beans that go nicely together, such as Ethiopian and Brazilian and another couple that stand in stark contrast with each other such as Sumatran and Kenyan and tailor blends based on those similarities and differences. At the end of the day though, nobody can say that one coffee is better than another or one blend any better than another. A cup of coffee can be a refreshing experience and a thoroughly enriching one.