Asian-American immigrants have more difficulty mastering English than Hispanics?

Asian-American immigrants have more difficulty mastering English than Hispanics - Washington Times

Key Points:

1. 54% of LA residents speak a language other than English at home.
2. 40% in San Franscisco
3. 51% in Miami
4. 38% in New York
5. 45% who speak Chinese are proficient in English.

#5 I wonder about... Strange results, that do not make sense with the fact of the earnings of Asian Americans that are the highest of any racial group. 

The Rise of Asian Americans - Pew Research