The midsize sedan market may be becoming a niche segment, but that is not stopping Mazda from giving the 6 sedan a makeover. The 2019 Mazda6 now gets a sleeker, more aggressive look that highlights the sedan's sporty looks. Meanwhile, the cabin receives a minimalist redesign with heaps of leather and plenty of in-car features. Under the hood is a choice of either a naturally-aspirated gasoline inline-four or a turbo-diesel engine; both of which have been upgraded to deliver more power and less emissions.