Sydney is about 557 times smaller than Timor-Leste.

Timor-Leste is approximately 14,874 sq km, while Sydney is approximately 27 sq km, making Sydney 0.18% the size of Timor-Leste.
Tip: This to-scale comparison of Timor-Leste vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.