@luftlesen @Sujiyan not really as difficult as learning Japanese itself. English isn't as high context as Japanese.
The main problem is that the Japanese tend to learn English for the express purpose of passing entrance exams, rather than as a second language. They can be good in English if they're employed in certain positions where English language proficiency is a job requirement.
If 渋谷果歩 can do it, other native Japanese can also do it.