Significant improvement unlikely. Why not look at a product that is truly innovative using proprietary technology instead of the same chip sets that almost everybody else is using. The Chord Hugo will be a significant improvement. Plus you get a headphone amp to go with the dac, and since it is battery powered, you don't need a high dollar pc either.
I use a Sony X779 ES as a transport with a Tara RSC digital cable to the Hugo. Simply awesome.