PrimaLuna vs Mystere

Has anyone made direct comparisons between PrimaLuna and its higher-end sister brand, Mystere? I would venture a guess that they should perform quite similar, but I wonder if Mystere uses better parts which may result in superior sonic performance?

Also, what is the overall general consensus on the sound of Mystere? I've read some reviews that it doesn't express the typical valve sound, but I wonder if anyone here has experience with their preamps and amps. I guess characteristics of their 'house sound' is what I'm looking for.

I'd appreciate any insight! Thanks in advance.