The RX 350 F Sport is a slightly breathed-upon, up-optioned version of Lexus's suburban fembot, including a stiffer suspension and bigger, racier wheels and tires (19-inch alloy wheels wrapped in pretty aggressive Dunlop all-season tires).
WSJ: 2013 Lexus RX 350 F Sport Review: Dashed on the Rocks of the Lexus Dash | Rumble Seat by Dan Neil