As I often state, I am not a fan of limousines, ie 4-door sedans. Estates / wagons beat limousines in practicality and mostly look much better. If you want more sporty get a coupé. Then there is the new (old) breed of sporty 5-door sports coupés, they used to be called fastbacks. Many of them are interesting like BMW's 5 GT, even desirable like the Panamera, some are quite elegant like Audi's upcoming A7.
This Kia Optima (Magentis) is a shape I like. Subtle, not the bloated over-styled character lines that many Euro cars now feature from Ford, Mercedes, Citroen and even BMW. Subtle yet interesting. Clean, yet detailed. Good job.