On what do you base this claim?
I myself like my tube amps, but so what? The vast majority of audiophiles use solid state amplification and are very happy with it. (And that includes many who have compared with tube amps, or who had previously owned tube amps).
That is because a good tube amp will cost a lot more money compared to a SS amp. To get the same performance you need to spend quite a bit more. If money is not an issue, most people would go with tube.
The "haze" that you keep speaking of remains completely anecdotal so it doesn't really address Amir's points about how to reliably make such determinations.
The "haze" is there. In the old day it is very apparent in SS amp, but now SS has gotten a lot better so you don't notice it as much but a listen vs. a good tube amp will reveal it. FET amp tends to be guilty of this more so than Bipolar.
Look if SS is so perfect than nobody would use tubes. But SS has its flaws but people will ignore it since it can output a lot more wattage vs. tubes.