Since many C and C++ implementations use LLVM, which Julia also does, it is frequently the case where C/C++ code and Julia code when fully optimized end up performing almost identically. However, what makes me love Julia is the programmer productivity, in general I can write many fewer lines of Julia code, and get generic code that runs as fast as my optimized C code, in about 1/3 the time (so I have time to spend with my kids, or simply hack more!)