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The aim of this paper is to give a qualitative and quantitative comparison between the commonly used transducer dedicated to electric (E) field measurement. A review of the several kind of sensor (antenna, electro-optics, bolometer, IR thermography,…) is firstly proposed and respective diagrams of merit are given. These later ones include parameters such as sensitivity, dynamics, spatial and temporal resolutions, frequency bandwidth, selectivity to one vector component of the E field and invasiveness of the measurement. This comparison finally demonstrates the suitability of electro-optic (EO) sensors to perform fully vectorial characterization of the E-field. The theoretical principles of EO technique are then reminded, from the E-field induced birefringence modifications of a non-centrosymetric crystal, to the exploited modulation to finally extract the proper information about the E-field vector. The last section …