New estimates released Thursday by Japanese market research firm BCN place the Samsung Galaxy S at the top of Japan’s smartphone charts. The powerhouse it displaces is none other than Apple’s 32GB iPhone 4 — a handset that took Japan by storm when it launched earlier this year. For 18 weeks straight, the iPhone 4 had been Japan’s top seller. In its debut week, however, the Galaxy S managed to take the top spot, though only when considering the 32GB and 16GB iPhone models individually. Whether or not the Android 2.2-powered smartphone can maintain pace remains to be seen, but Samsung should certainly be pleased that it has a hit on its hands in Japan.

[Via 9 to 5 Mac]