Kia offers a trifecta of large sedans ranging in size and cachet, starting with the Optima, followed by the Cadenza and finishing with the K900, with pricing beginning in the $20k, $30k and $40k range respectively. And now it’s time for the arrival of the Cadenza’s second generation with a stronger yet lighter body, a heightened level of sophistication and the brand’s first implementation of a front-wheel drive 8-speed automatic …