@vonhelmholtz I had written to Shunyata as per your suggestion asking them for the measurements & below is the response related to measurements.
"We've published our own measurements on our up-market Everest and Denali power distributors that show a -68dB down at 1mHz noise measurement, which is top in the field.
Besides as a fun fact check out the datasheet for the Schaffner's two stage single phase EMI Fliter from the series FN2090. For 20A rated filter it's noise attenuation at 1Mhz is close to 80dB for CM & close to 90db for DM which far exceeds the performance of Everest/Denali as claimed by Shunyata & while Shunyata's products cost north of $6K whereas the Schaffner's filter costs mere $60.
Now I have developed a feeling that these companies do not publish the measurements because they actually don't measure well especially compared to their asking price. Otherwise if they publish the data then people can easily point out the issues with their asking price and actual performance. If their performance was world class they would be harping on it by publishing the hard facts/measurements which clearly is not the case with all these companies.
Audio_phool