Four recently developed models involving equations of state combined with the UNIFAC G(E) expression : MHV2, PSRK, LCVM, and the Wong-Sandler models are compared with respect to their performance in the prediction of vapor-liquid equilibria (VLE). The following cases are considered : (a) polar mixtures with components of similar size at low and high pressures; (b) asymmetric systems containing supercritical gases and n-alkanes; (c) infinite dilution activity coefficients in asymmetric hydrocarbon mixtures. All models perform satisfactorily in the VLE prediction of symmetric systems (case a), but only the LCVM model for asymmetric ones (cases b and c). The conventional gamma-phi approach has also been included in the comparison when applicable; i.e., low-pressure VLE.