We are all subject to expectations and preconceptions. However I find a reasonable way to tell. If I think a new something is simply good (better than the old), or bad (worse) - that's when I have to wait. I have to listen more, get used to it, and recognize the plusses and the minuses. Only after that, can I judge.
Bad news for audiophiles?
In new study a bottle of wine priced at $90 tastes better than a bottle of the same wine with price tag of $10.
http://www.cnet.com/news/study-90-wine-tastes-better-than-the-same-wine-at-10/
http://www.cnet.com/news/study-90-wine-tastes-better-than-the-same-wine-at-10/