Yeah, I wouldn't go for this RC F. It seems like there are certain things holding it back from being 10/10ths.
And those looks!!!
As for the Audi RS5 feeling more ponderous during turn in, welcome to Audis with longitudinal engines.. With the engine center sitting so far ahead of the front wheel centerline, it is going to under steer like hell. Quattro does a good job of trying to mask it, but there is no defeating physics.
In this category, I would be going C63 or M3/M4. If I don't care about the luxury, Mustang GT.
As for those talking about the color, it seems Lexus ripped off BMW's M3's Fire Orange: