"Support streaming in masters" is quite different than rendering in masters. Then there's the question of what does "render" really mean? The D/A can perhaps pass a pristine master output which the amp, or more likely the speaker, messes up.
Having said that, even on the Air Force or Freedom, I have no trouble distinguishing between a low fidelity and higher fidelity recording. I don't know though if I could tell the difference between HiFi and Masters. I think it would depend on how well the piece was engineered.
