South Georgia and South Sandwich Islands is about 3.5 times bigger than Hong Kong.

Hong Kong is approximately 1,108 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 252% larger than Hong Kong.
Tip: This to-scale comparison of Hong Kong vs. South Georgia and South Sandwich Islands uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: South Georgia and South Sandwich Islands vs. Hong Kong