Thanks Milsabords for your exhaustive commentary.
Just to clarify: I didn't want too much tech talk in this thread, that's why I avoided posting details about the recording chain.
Here it is: microphone (mono!) professional cables (Van Damme) ---> Tascam HS-82P (stand alone) ---> Protools 12 ---> mixdown to 44.1/16 stereo wav.
This is a professional chain. Having compared the preamps of Tascam HS-82P to most expensive pres (Millenia Media, AEA TRP etc.) I came to the conclusion that I like the pres so much I'm just using them straight away.
How your friend listened to the samples I of course don't now, but that she doesn't hear 'any' differences is beyond me. For me the differences I hear are quite clear, and I only called them subtle considering the much less subtle price differences of the mics.
The other problem you are pointing to is a completely different issue and a very valid one: there is not so much difference in the sound of classical guitar in the far soundfield, and probably even less in the sound of flamencas. Each end every one is clearly recognizable as classical or flamenco guitar. Their main differences are timbre, clarity, separation and projection that alow to discern individual instruments. In near soundfield it's different.
As to Mundo Flamenco recordings: I don't see it that they are 'a priori good'. Maybe they start out good, but then they use too much compressors and especially reverb for my taste. With too much reverb every guitar sounds almost same
Music is a big continent with different landscapes and corners. Some of them I do visit frequently, some from time to time and some I know from hearsay only ...
My Youtube Channel is: TheMusicalEvents