Meanwhile did some upgrades, coming up from only stock PCs...
Wall -> Thunder -> Niagara 1000
Niagara 1000 -> Thunder -> PowerAmp
Niagara 1000 -> NRG-4 -> PreAmp (no more space left so have to buy a new Rack)
Niagara 1000 -> WW Silver Electra 7 -> Wadia CD
Niagara 1000 -> a very small Computer for Tidal, Netflix, ...
Other Wall -> Sun -> NRG-4 -> B&W DB2D Subwoofer (will replace with Thunder this summer)
And minor stuff like the TV, TV-Box, cheap BD-Player.
Replaced the Fuse within the PowerAmp.
Overall the whole system sounds way more responsive. More transients (love it). Faster. Incredible.
I guess even the Thunders should be better than the old Top of the line just because of the new 3-cable-braided-Design.
Will replace the outlet soon with Furutech.
(Replaced the IC from Pre to Power with AQ Fire. WOW! All HDMI are now AQ Carbon.)
Lots of money (for me) within just 2,5 months.