This comes down to a very interesting quesion IMO.
What is sound quality?
Faithful capturing of the signal that the microphone is presented with or is it down to enhancing it?
There may be mics that can enhance a saxophone (in a given genre) but are horrible for violins.
There are mics that make you sound better, but might not make me sound better.
So in my studio, I have a range of mics from el cheapo tiepin, vintage ribbons, SM58, STC, Neumanns and $4000 AKG V12. There is no way to say which is best at any one given instrument, genre or situation
I apologise if that seems less than helpful but hopefully it is food for thought (NB: R.E.M. recorded me on an SM58)