Bricasti M25 seems to.be a popular amp for sure. What I've read it's a clean, analytical and detailed sounding amp. Of course, I've never heard it. I'm primarily listening to the Ktemas using a Italian brand Synthesis A40. This is only a recent change within the past month. Prior, for the past decade I drove the Ktemas with Accuphase A70. I have no doubt the Air Tight amp did wonders. I know I read Franco himself used tubes for his own system.
I really have not heard Ktemas outside of my system. I have heard the Accordos on a few occasions over the years. I saw the Essence in Tokyo in November, but the Japanese are not so willing to allow auditions unless willing to buy. Although, the Ktemas they did have on hand were serial number 001. Wonder how they got their hands on the first edition. Mine is serial.# 075, so still early stock. After multiple moves around the world, they are starting to show some age. Strings are losing it's elasticity and smudges on the chrome, but they are still singing without issues after 11 years. They are really well built for sure.