First of all that's only true when it managed to jit the code, secondly only until you try to do any of those slow things. For instance the C ABI emulation they have both cannot support all of CPython and wrecks performance. The same is true if you try to do fancy things with sys._getframe which a lot of code does in the wild (eg: all of logging).

In addition PyPy has to do a lot of special casing for all the crazy things CPython does. I recommend looking into the amount of engineering that went into it.