Not sure about the ES 20 100
Etc WF EPs
20 es 100 seems to have greyish background image of them
Don't get me wrong the 20es100 is a very good EP but I lean towards others personal preference
One note on this is more stray light moon sky glow etc the ES becomes increasingly greyer background
I noticed that the 30es82 is Really guilty of this
Based on exit pupil alone, the background/constrast would be best/darkest for the highest power:
17es92=17 Ethos darkest background/most contrast
20T2=ES 20 100
30es82 lightest background/least contrast
Background/contrast is part of what makes the majesty factor, the other aspect is power magnification for seeing detail. If you can match same TFOV, the higher power would have the greater majesty factor and wider AFOV.
Also once the eyepiece exit pupil exceeds the observers eye night time/scotopic pupil (wasted light falling on observers iris), then the only advantage would be gaining wider TFOV till you reach 40-41mm 68-70 AFOV in a 2" eyepiece. The only way to get a wider TFOV would be to go with a larger focuser/larger barrel eyepiece with and even greater exit pupil and lighter background (and this is most practical for refractors without a central obstruction).