Are you talking F82 or G82 M4?
The G82 M4 is leaps and bounds more insane than the old one, and it blows the entire competition out of the water (RC F, C63S, RS5, CT4-V Blackwing), all for a pretty good price. The RC F is just atrociously expensive for what it is, and I love the RC F as a car.
Had the M4 not been ugly in the front, it'd sell even more than what it's selling now. It's that good and has gotten rave reviews across the board.
And had Lexus not backed down like they always do and stuffed in their twin-turbo V8 (that's set to debut in the LFR) in every single F product, you'd have a way more competitive Lexus today.
The LC is completely an 8-Series competitor. It is meant to compete against that, as well as the Mercedes-AMG SL, Jaguar F-Type, Aston-Martin DB12, Bentley Continental, and much more.
The LC punches way above its weight in terms of class, elegance, and even performance for the type of car that it is. The RC F, isn't. The only saving grace is that it is now the *lightest* car in the segment. How insane is that......