Went to Lusaka on a few occasions (at least 3 or 4 times a year for the last 3 years) for about a week or two, I will move there in a heart beat (the missus not so much as she is verrrrrrrrrrrrry family vas). The traffic is bad and nobody can drive but apart from that I can not fault the place. Less crime, it is waaaaaaay cleaner than most cities in SA and I am yet to see someone beg at a street corner.
Most of the people I dealt with was working 2 jobs (living cost is steep) but everybody seems happy to do what you ask of them and they just want to learn and sponge up as much knowledge as possible. I really dig the place.
We have been thinking of opening a branch there for some time now, as there is not much (If any) competition in our field there and the market is begging for a quality product and a proper corporate service.
You have it spot on Soundboi, the traffic is BAD in Lusaka and throughout the country nobody can drive, there are accidents left, right and center! But apart from that I can't find fault with the place and I believe there are LOTS of business opportunities in the country. If I may ask, what industry are you in?
Living costs are very steep and therefor the people are willing to work. And you can see it in their physique. I am yet to see an vat/obese Zambian

Crime.....what is that? We don't have armed response, guard dogs, electric fence, complex security etc, still we leave our house unlocked with all our valuable/laptops etc inside the house when we go out, we just close the gate (which does not have a lock).