I sold my SR1a and will likely sell the CA-1a. I use them with the RAAL VM-1a tube amp and Star8 cable. So, I have an excellent setup.
I took my gear down to Ventura, CA to the RAAL office and heard both the Magna and Immanis. From my limited experience with headphones, it was easily the very best phones I have ever heard. The Immanis was my preference, but both are great.
On Head-fi.com there are some very interesting comparisons with the TOTL phones. So far in the limited feedback, the Immanis seems to be coming out as the favorite.
I am actively looking for a second job, and one reason is to buy the Immanis. I say this as someone who loves the SR1a and CA-1a. Good thing since it will take me some time to get the funds.