My same comment again - you have to learn what make sound do what it does. Look at the designs and you can see resemblance in designs. Then there are bigger differences like tubes, separate power supplies, etc. Most of the DACs in the $1K to $3K price range are very similar in design. Learning to hear the differences is great but if you have to struggle to go back and forth to hear them, IMO just stick with what you already have. We tell people all the time, if you don't hear the differences within 30 seconds, then just return our product.
Happy Listening.