Here two source for this comparison.
1. The absolute population of each country. From this, we see that Haiti as more people than Hong Kong and that Haiti growth is more steady.
What about population density? Here, we see an embed of this comparison done be Wolfram Alpha.
The most important numbers are:
- Haiti | 358 people/km^2 (people per square kilometer)
- Hong Kong | 6701 people/km^2 (people per square kilometer)