I have had the chance to compare newer against older preamps from two companies.
ARC ref.3 vs. ref 2 MKII
Ayre K-1XE vs. kxr
In both cases the newer models were more transparent, detailed, better extention both top and bottom, all without loosing the musical sound that keeps you in your chair. So from the ones I have heard the newer preamps are getting better.
I have heard the new BAT VK-32SE also and owned the VK-31SE and feel the BAT is better too. But I have not heard the BATs side by side.
Also all three were quieter, mainly the ARC.
ARC ref.3 vs. ref 2 MKII
Ayre K-1XE vs. kxr
In both cases the newer models were more transparent, detailed, better extention both top and bottom, all without loosing the musical sound that keeps you in your chair. So from the ones I have heard the newer preamps are getting better.
I have heard the new BAT VK-32SE also and owned the VK-31SE and feel the BAT is better too. But I have not heard the BATs side by side.
Also all three were quieter, mainly the ARC.