I too went from Pontus II to Venus II...I upgraded my Eversolo A8 to HiFi Rose 130 transport also. Each step did show wider sound stage, airiness, more detail, while not being harsh.
One thing I noticed was my I2s doesn't work correctly when I added HiFiRose 130(did work fine when I had Eversolo A8). I now use higher end Transparent Audio digital coaxial cable and works fine but would rather use I2s. Does anyone have advice on how to set the I2s settings in the Venus II?. I know how to do it on Hifi Rose 130.
Also, so going from Venus II to 15th very much worth it or would going up to the Terminator 15th be better choice?