After spending a couple of weeks with 1.4.2 I find myself going back to 1.2.7. I started to feel 1.4.2 a little to high in the highs. Although this was not my impression after installing it. I am curious how 1.2.7 will sound to me now...(haven't had the time to listen after the factory reset)
I find returning to 1.2.7 very relaxing. The sound is not so "precise" as 1.4.2 but it compensates with more "musicality" - excuse the personal terminology but I am new to the hobby and english is not my native language.
The 1.4.2 sounded clear but made my 5.0's almost sibilant some times. The bass was more controlled but less warm and lush. I am still listening critically and trying to decide but returning to 1.2.7 was almost like returning home from a vacation: warm, relaxing and familiar.
The whole comparison is made taking into consideration 5.0's response to the software version.
Setup: dx100 - rsa intruder - heir audio 5.0
My 2 cents...