Yes, early masterpieces, already beyond Mozart
Mozart's genius lay in his purity of Melody, and his ability to compose consistent quality in mass bulk.
You can hardly describe Mozart's melodies as anything but pure. They're largely non-chromatic (appogiturras don't count) and triadic, thats not pure? But Mozart's genius was more than just that, that however was the contrast I wishes to make with Beethoven.And yes, there was quality control. If the music wasn't good, it wasn't published. End of.