Greenland vs China: which is bigger?
China is bigger: 9,596,961 km² against 2,166,086 km², about 4.4 times the size of Greenland.
Drop Greenland onto China →Side by side at true size
Both drawn at the same scale on an equal-area projection.
And on the usual world map
On the usual world map it's the other way round: Greenland looks 2.3 times bigger than China, because the map inflates Greenland about 16 times and China only 1.59 times.
In numbers
Areas: official totals including inland water (UN Statistics Division via Wikidata). Outlines: Natural Earth. How Globegami works