I don't know. I think it will all depend and time will tell. I was a bit disappointed to hear that the new 300B amp wasn't direct drive, as that does seem to unlock something for the Raal headphones. However, it still sounds very interesting and I'm sure it'll still be an amazing amp. Just will have to wait for a lot more impressions between the two and try to hear for myself.
I heard the Immanis at Axpona w/the Envy and VM-1a. First starting out on the Feliks and then moving to the Vm-1a. I was a bit surprised that the Immanis sounded a bit better on the VM-1a vs. the Envy, although admittedly I had never heard the Envy. Danny mentioned that he was eager to hear my thoughts the differences I heard, and after I shared, he agreed with the assessment. Ultimately the Felix sounded a bit softer overall and less authoritative in the bass. You can see the detailed point in the last bullet of this post in my thread
here. Comparatively though, someone may prefer that sound of the Felix for it, particularly if Ribbons may be a bit too aggressive to begin with. And lastly, to be very clear, I found it very good off the Feliks and I would've never thought twice about it if I hadn't moved over to the VM-1a. In fact, I almost didn't because I had limited time and there was one person on it. They just happened to get up as I was preparing to leave.