I have been wondering how come the HSK list be so diferent from the list of the most used Chinese characters.
The only list I know about character frequency is Jun Da's list. On the first 2635 most common characters of the list (I picked 2635, because it's the total number of the HSK characters), there are exactly 305 characters that are not listed on any HSK.
On the rest of Jun Da's list (a total of 7000 characters) there are another 304 characters that are on the HSK list, but are way way farther than the most used characters (the last two rank at #4527 and #4771).
1. What are the criteria for the character choice on HSK?
2. Why is the HSK list so different from the most used characters list?
Additional comments are very welcome.