Does fine-tuning lead to better adoption of a specific writing style than just providing in context examples?

Conclusion so far: not by much, if at all. 

This is important because if it turns out that fine-tuning doesn't beat examples by much, that's great news for products that are trying to mimic an individual's writing style. Fine-tuning is expensive and inconvenient. Collecting samples of a user's writing is much easier.

Trying one more fine-tuning hyper-parameter configuration before I can make a more definitive call.