to page 23 we see population estimates of:
#27 Congo (Dem. Rep.) Kinshasa 12,960,000The whole thing is full of amazing stats (there are now 38 urban areas with populations over 10 million) but the Francophone tidbit (it's not highlighted in the report but you know they speak French in Kinshasa) kinda jumps out at one.
#33 France Paris 10,960,000