Consider this my formal application to be a reviewer on WHF.
Another immediate observation was both Pioneer remotes operate both players, so that has been fun and games watching one drawer open while the other one closes, etc. It took me a while to load one disc in one player and through trial and error I found the best way was to catch one unawares by pretending to walk away and then quickly turning and zapping it! Anyway, that small hiccup out of the way, at least it gave me chance to compare the two drawer mechanisms and I can now report that the S8021 goes brrrrrrrrrrrrr shuckt, while the D6 is set to a higher pitch and goes brrrrrrrrrrrrrrr shuckt but an octave and a half higher. I guess you'll have to use your imagination on that one. It was a worthwhile observation though as the D6 boasts the Legato Link Pro, er... thingy, which obviously accounts for the higher pitch.
More pearls of wisdom to follow.