for me, the new firmware 1.4.2 offers more weight in the music and bass impact is greater.
prat wise a little more aggressive than it needed to be and it can get a little annoying with some faster tracks moving faster than it need be.
micro details seems to have been pushed into the background further (it's still there but harder to catch).
That said, i do find the new firmware enjoyable. May not be my favorite but it does fare well with 1.2.7 and 1.3.7, all of which have their own strengths.