That's not that amazing at all, because the fame and weight of being the creator of the former led to the adoption of the other as it became the official version control management system on which Linux was developed. — These are not two independent results.
If someone completely unknown developed Git 0.01 in 10 days, it would probably have stayed relatively obscure, and the reason for it's quality is because it became so famous due to being tied with Linux, attracting many developers.