In Qing dynasty, MAs deteriorated significantly from previously. In particular, internal energy became less and less advanced with each generation.
So, if XF got born in Qing dynasty, he would be only have access to crappy MAs (compared to previous dynasties).
Given his supreme talent, how high in martial arts can he get?
Let's say that he learns some of the best MAs of the time:
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1. Could he surpass the #1 fighter of the novel?
2. In any of these novels, could he reach Song dynasty Great level?
3. What if he stumbled upon a long-lost Great-level manual, could he reach Great-level?