It is a matter of perspective, I agree. But I prefer to make that differentiation (too many people as opposed to too little food).
If Africa can solve its problems, it tribal warfare, mutual hatreds, (in some cases) Islamic Fundamentalism etc. and devote her attention to feeding her population, Africa can comfortably support a much bigger population than at present.
The same cannot be said of Asia. Asia has so many people that it cannot feed too many more, it is close to reaching its limit. Africa is nowhere near its limit.
I believe Asia, also, has a raging HIV epidemic. India's considered South Asian??
Them too.
With regards to Africa solving its' problems, etc......I don't believe you're going to see that anytime soon. Unfortunately.
Tribalism's a bitch.