I know some Chinese, having worked in China for a number of years. Maybe Japanese will be easier for me.
By banking, I meant that since I intend to do investment banking, either on the business side or as a legal counsel, I hope to learn a language that will help me most in the career. Since Germany is the 3rd largest economy, and Japan second, Japanese and German seem like idea languages.
I don't know what French is good for in the financial world, UN has 6 official languages, English, Russian, French, Chinese, Arabic, Spanish. The office of secretary general I believe uses French or English.