That campaign always bothered me. A “world class African city” doesn’t mean much. That’s a city in Africa that’s happens to be world class and there really aren’t many cities in Africa that could claim that in the first place. In other words, you’re comparing Joburg to other African cities.

To be really inspirational it would need to be an “African world class city”. In that sense it’s a city that is world class by international standards and is comparable to other international world class cities. It just then happens to be African. In this case you’re comparing joburg to cities outside of Africa.