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TheSource said:

In November, 1990, Nintendo launched the 16-bit Super Famicom system. Within five months, Super Famicom system sales have exceeded 1.4 million units and claims a majority of the 16-bit market in Japan.

Mega Drive launched two years before Super Famicom (October 29 1988), but Super Famicom overtook it within five months. I'm surprised Mega Drive hadn't even sold 1.4m after 2 1/2 years in Japan.

PC Engine launched October 30 1987, but was technically 8-bit, so was probably still ahead of Super Famicom (it went on to sell around 7.5m in Japan).