A. "a fine sounding instrument"
B. "an exceptionally fine sounding instrument"
C. "an extraordinary sounding instrument"
D. "an excellent sounding instrument"
E. "a great looking and superb sounding guitar"
Interestingly, descriptions appear for some new as well as some vintage instruments. Without peeking at the Gruhn inventory page, you might try matching the above descriptions to the following guitars:
1943 Martin D-18
New Martin Ditson Dreadnought 111
New Martin Custom 0000-28
1939 Martin 000-28
1927 Martin 000-18
Any thoughts about the terminology, either as used on the Gruhn site or on others? Here's a question to seed the discussion: Now that you've made your matching guesses, go check the site and see what you think of the pairing of adjectives and instruments? Are they "sound"?