I've owned both the old and new version of BA200. I don't have access to the "big boys" for I've only had R-50 and Monster Turbine Copper. But I'll share to you my listening experience up to this point with BA200. I have over 400 hours of listening time on the old version vs. 100 hours on the new BA200. In terms of SQ, the new BA200 retains the smoothness, clarity, and bass of the old version. The only difference that I've observed between the two is that for me, it seems that the new BA200 is less forgiving on the quality of the audio file. With the old BA200, I could listen to music with 192kbps mp3 quality without any issue. However with the new BA200, I could definitely hear the distortion whenever I played those audio files with 192kbps. Just to make the issue is not because of a defective IEM, I've listened to numerous orchestra albums ( FF - Distant Worlds, Journey OST ) with FLAC format, and I've not heard any distortion when playing the music.
You mentioned that you have with you the R50 from Rock It Sounds. I am interested to know how you feel about the two comparatively. Im currently deciding between either one as an up/sidegrade for my RE0s