A size comparison
lines bytes C 2471 62k CoffeeScript 533 14k
That right there is CoffeeScript's chief advantage over C. The CoffeeScript is 4 times smaller, meaning CoffeeScript programs are likely to be faster to write, easier to maintain, and contain fewer bugs.
What makes the C code bigger? There is a lot of memory management, and an awful lot of string copying and substring extraction. There is an implementation of a hash table (for labels).
Obviously we all knew that high level languages resulted in smaller programs, but it's rare to get the opportunity to do such a direct comparison.