Is it right that English is most important factor to success?

English is the main door to knowledge and people worldwide.
Knowledge gives you a value.
People gives you opportunities.

Soft skills (sense of responsibility, open-mindedness, etc.) are the most important factor to be successful.

Definitely, English is the must for any knoweledge staff, how come that you can not speak english in FDI and foreign companies. I have been in recruitment industry for 10 years and English is the key. In the selection process for good position, English the the screaning factor. It means that without it, you can not go further into the next level.

The question should be "Is foreign language skill is the most important factor to success?", because not only English, but Japanese, Mandarin, Korean, ... can help you become a successful person.
However, foreign language skill is not the most important factor to success. It's just a necessary means to success.
The most important factor is your determination. All other factors such as skills, talent, knowledge, experience, spirit...can be obtained during your path to success, with a strong determination. But without determination, you will get stuck in the middle of the route and can not continue, or turn to other direction to become a normal person, or eventually a failure person and don't know how to stand up again.

English is very important if you work in foreign company. If you know english you can understand some document in english and can communicate with foreigner

There are many reasons for success. I think learning English or any other language is one way to difference yourself from other people you are competing against. Like most business skills knowing something and USING it are 2 different ideas.

Many people are studying business, English and other skills...it is HOW you put those skills into effect that make a difference.