Not so long ago the sedan seemed to be on its last legs in the Aussie new-car market. But EVs, the Tesla Model 3 in particular, have changed that. And now a new liftback-style electric sedan, the MG IM5 has arrived to challenge not only the Tesla but other EV five-seaters from BYD (Seal), Hyundai (Ioniq 6) and Polestar (2).