Is the kilogram still consistent with the old definition?
The kilogram is likely to be redifined in the near future as a function of the number of atoms of a sphere of ultrapure $\ce{^{28}Si}$, as per the answer to this  Chemistry SE question. 
That means that the standard will be the Avogadro number, and the mass will be a derived unit. 

Then, any stored mass anywhere will just be an historical curiosity. 
This does not mean that it has not been important. 
We need exact measurements as Lavoisier taught to all future chemists.
At that time it was the best that was available. 
Now we might go to a still better standard.