These two comments came up in a JBoida's recent 'Dispelling myths' thread:
So I was wondering and thought it might be interesting to ask - yes or no? - how many of you are in favour of patinas on your knives?
Myself, if I have to choose, I'm starting to move towards a 'no patina' stance, particularly if it's a more expensive, well-finished knife. So my answer:
No.