Well, it could sound "better" than fantastic! That's the thing with audiophiles. How do you ever know for sure "that's as good as it gets"? I've had the system sounding great and then do something to muck it up. Then throw more money at it for different but not always better.
By all means, try a different power cord and different footers, different for sure but not necessarily better.
By all means, try a different power cord and different footers, different for sure but not necessarily better.