Many cars have challenged the perpetually great BMW M3 over the years, with the Mercedes-Benz C63 AMG sedan—introduced in 2008—among those that have come closest to knocking off the M3’s crown. With the C-class coupe debuting this year, AMG’s newest product was a bit of a no-brainer. Still, we don’t see the C63 AMG coupe so much as a two-door version of a sedan but rather as the M3’s most formidable and natural competitor yet. Funk Flex