I created 3 charts regarding rating distribution in Codeforces.

[Updated] Slightly change chart 2 and 3 to show rating colors.

1. Rating distribution in Codeforces
   
   This chart is rating distribution in Codeforcers similar as one shown in TopCoder profile.
   Purple markers and lines show cumulative rate.
   
   
2. Coderforces vs TopCoder in Japanese participants
   
   This scatter chart shows Codeforces ratings and TopCoder ratings of who met the following conditions:
   
   - has the same handle name both in Codeforces and TopCoder.
   - is listed in Japanese TopCoders
   - participates more than or equal to 5 times both in Coderforces and TopCoder
   
   There are 56 samples. Correlation coefficient is 0.87.
   Of course, even though they have the same handle names, they could be different person. There should be who uses different handle name between Codeforces and TopCoder. So, this chart is far from complete. However, it could show rough image.
   
   
3. Codeforces vs TopCoder
   
   This scatter chart shows Codeforces ratings and TopCoder ratings of who met the following conditions:
   
   - has the same handle name both in Codeforces and TopCoder.
   - participates more than or equal to 5 times both in Coderforces and TopCoder
   
   There are 427 samples. Correlation coefficient is 0.82.
   The note for 2nd chart is also applicable to this chart.