Nobody remembers the 2010 Kia Optima, but just like that, the 2011 model may be the mainstream sedan to beat. While some consumers – the uninformed and brand-bigoted – might remain skeptical, the 2011 Kia Optima is the new benchmark. How could the Optima go from warmed-over also-ran to the segment’s latest front-runner? The 2011 Kia Optima is at once classy and striking. There’s just enough detailing to keep it interesting without looking gaudy....