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The main context where I've seen claims that CPUs are 'better' at graphics is where a render that looks precisely right and has the desired image quality is more important than a fast render.

Even that is more about control over the rendering process than what silicon is doing the work. With a lot of (older?) graphics APIs, you're implicitly giving the GPU's driver a lot of control over the output and how it is generated. This is how we got events like [0] where GPU vendors would make their drivers 'cheat' on benchmarks by trading image quality for speed when certain criteria were detected.

I imagine that tradeoff has changed somewhat as the industry has moved towards graphics APIs intended to give the programmer more direct control of the hardware.

[0] https://www.reddit.com/r/quake/comments/168btin/does_anyone_...