I have the MSL Gold Signature. I replaced my Lyra Titan i with you about two years ago. At that time, I was considering the Lyra Etna SL. The MSL was described as between the Lyra and Koetsu. That is "analytical" vs. "lush", respectively, if on a continuum.
I'm super happy with my MSL Gold Sig. It is super supple, digs deep, renders vocals beautifully, has tons of body, etc.
It was a huge leap up from my older Lyra. Of course, the Titan was an older model so I expected an improvement and this resulted in a very big one. Of course, I can't, truly, say how different it is to an Atlas or Etna.
But, it has not left me wanting more or questioning anything--other than what else can I do to extract even more info out of it and the rest of my turntable/arm.