I have owned the Shuguang WE KT88 Plus for nearly a month now and in my Don Sachs Kootenay 120 Amp, the WE Plus take the top spot! As with anything it comes down to preference and for me I lean toward neutrality.
The Sophia Blues are very open and dynamic sounding with a touch of warmth that can tame forward sounding systems but this warmth in my system doesn't allow the sound to detach from the speakers boundaries.
Adding the Shuguang WE KT88 Plus to the mix changes the whole sonic perspective, the speakers disappear and you are left with an expansive sound stage that takes you so much farther into the recording and this is probably due to this tubes astonishingly lower floor noise.
The WE are very neutral and doesn't seem to have a sonic signature, they just capture the essence of the venues acoustics with an uncanny and believable presentation; you feel as if you are physically there...
No doubt that the Shuguang WE Plus and Sophia Blues are the best sounding KT88 I have owned.
Wig