In solids and liquids, the distances are short, so "electrons" are the most striking observable thing there, as Corribus put.
Farther from the molecules, for instance in a gas, you may observe electric and magnetic fields, dropping quickly with the distance.
"Quantum fields" if you wish... But what are the concrete consequences? As far as I know, observation was made within atoms, where the electric field is big. For usual life, "vacuum is empty" is quite accurate.