Infiniti's M sedans are big, spacious vehicles, with more of a focus on technology and sporty driving response than on outright comfort. The M's exterior design doesn't especially stand out, although there's no denying that it's a longer (yet less aggressively styled) sibling of the G37 sport sedan. Inside, the M35 and M45 feel much more luxurious than their smaller siblings, with plush appointments and a more conservative appearance.