Yesterday, here in Japan, I went to a Spanish restaurant. I haven't studied any Spanish since high school and never intensely or at a high level. I did, however, remember, "Tu hablas Español?" which I said that to the waiter, who then responded with "sí". I then proceeded to checking out the menu and realized that I could read most of what was inside. This blew my mind. Even after living in Japan, and studying Japanese each and every day, I still can't read half of what is written around me.
It made me aware that I could probably become fluent in Spanish, French and Portugues before I could become fluent in Japanese, much less much Chinese.