As the first model to wear the Lexus badge and the company’s oldest nameplate (introduced in 1989), the LS is arguably the most important vehicle for Toyota’s luxury division. Despite this, it took Lexus quite a few years to replace the fourth-generation model. While the first three iterations were sold for five to six years, the fourth-gen sedan soldiered on for more than a decade. Granted, Lexus introduced updates in 2009 and 2012, but the LS was a bit long in the tooth compared to its competitors. Come 2017 and the fifth-gen LS was unveiled at the Detroit Auto Show, and I finally understand why it took so long for the new full-size sedan to arrive.