Spectral DMC 20 II vs DMC 30 SV II

Hello and greetings from France ^^
I have some question about Spectral Audio devices and DMC préamp.
I have an old DMC-20 II, with two DMA 360 II, digital source is dCS Vivaldi II Drive + DAC and speakers Duntech Sovereign PCL 2001. Full MIT cables.
The DMC 20 is a wonderfull preamp, but it's old, and I look for a DMC-30... the problem is : in France there is no Spectral Dealer. In europe, I need to go to Germany, Italy or Holland to find Spectral Audio dealers... In consequence, it is almost impossible to make a real test at home with a DMC-30 demo unit.
The DMC-30 SV II is available at a very high price in Europe (25000 euros = 30500 dollars) and I don't want to spent so much money for a device I didn't know.
So the questions :1/ Is the DMC-30 SV II device that much "better" thant an old DMC-20 II ?2/ Does someone have the experience of these two devices ? How the DMC 30 sounds like ? Wich improvment may I hope on my system ?
Many thanks for your help.