I'd actually say both Julia and Matlab are often quite decent on both learnability, usability (at least for their purpose -- especially as the library for Julia

I'd actually say both Julia and Matlab are often quite decent on both learnability, usability (at least for their purpose -- especially as the library for Julia develops), and performance. Certainly, on par with other newly-designed languages. Sure, you can go faster with Fortran, but you can do that when you see that it is really needed...