Nope. You are human being, just like the rest of us in this thread. I'm subject to the effects of expectation bias and so are you. That's why we do controlled testing to determine if there actually is a difference and we don't just trust our impressions. It's also why we make the effort to understand how digital audio works, so we can sort out the things that are more likely to make an improvement in sound quality, and which things probably aren't.