[Scott Fraser]

Ribbon mics don't have the hf response for a good sounding acoustic
guitar.
They go away pretty fast after 10 kHz. Ribbon mics have no "air." You really
need a condenser for that unless you have a really nasty sounding acoustic
guitar and there are some of those out there.

Just to corroborate, last week I was recording a pipa, a Chinese nylon
string lute with an extremely sharp attack, quick decay & a tendency
toward harshness. Seeking to tame the bright high end I initially put
up a Coles 4038, & upon first hearing it, we all unanimously agreed it
no longer sounded like a pipa. Ended up with a TLM170 into an HV3.

Scott Fraser