Vatican is 5.8 times larger than Hong Kong Park.
Area: 0 km2 World Factbook
Population: 842 (July 2014) World Factbook
Vatican City, officially Vatican City State, is one of the last six remaining absolute monarchies whose territory consists of a walled enclave within the city of Rome. It has an area of approximately 44 hectares, and a population of around 840. Wikipedia
Area: 0 km2 calculated
The Hong Kong Park is a public park next to Cotton Tree Drive in Central, Hong Kong. Built at a cost of HK$398 million and opened in May 1991, it covers an area of 80,000 m² and is an example of modern design and facilities blending with natural landscape. Wikipedia