Lexus IS Evolution 1999–2020 | XE10 to XE40 Transformation Lexus IS Evolution from 1999 to 2020 shows how the sport sedan matured from the original XE10 into the refined XE40 generation. This transformation highlights how Lexus balanced comfort, precision, and performance across four generations. The 1999 Lexus IS XE10 introduced sharp handling and compact luxury. In 2005 the XE20 added power and technology, while the 2013 XE30 sharpened the design language. By 2020 the XE40 refined the formula