Moving from the consideration that matter fields must be treated in terms of their fundamental quantum counterparts, we analyze models for early cosmology that involve fermion fields. We comment on the phenomenological consequences of this choice, and show that cosmological quantum perturbations can actually be accounted for in terms of Dirac fields. We recover a class of states of the Hilbert space that implement the semiclassical limit of the theory, and correspond to non Bunch Davies group coherent states. We then discuss quantum features of these non Bunch Davies states, and derive signatures for CMB observables also deploying path-integral methods.