Unfortunately, I must respectfully disagree with your blanket statement about the F80 being unable to reveal the difference between CD and Lossless Replay.
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Play Joni Mitchell "Blue"; much of Laura Nyro; early Van Morrisson; Horace Silver "Song for my Father"; Pavorotti / Mirella Freni / Von Karajan "La Boheme" from 1972; or any Yo Yo Ma or Ashkenazy recording and I will be able to tell you the difference between CD and Lossless on an F80 (never mind MP3)
Are you are saying that it's impossible to rip accurately or that a lossless media player plugged into an F80 won't sound as good as the F80 CD player?