Sol easily outperforms Fable on every task I've tried it on.
I can't speak for others but I have a feeling you're in the very small minority with this take.
You could say Sol is faster and cheaper and that's true. Outperforms Fable? Impossible to believe without hard evidence.
That's not my experience and I suspect it's not most people's experience. Out of curiosity, what's the hardest task you tried?