The new M sedans strike an unusual mix of luxury and sportiness that's unmatched in this class, with strong powertrains, nimble handling and a quiet, refined interior. Its new styling looks at once traditional yet flamboyant, and some will prefer the straightforward interior design to the screen-based systems in other luxury vehicles. Several new safety-tech features--including Blind Spot Intervention, which INFINITI says is a world first--also set the M sedan apart from some of its rivals