The details on Denons are ...I'd say "balanced". They are there, but not over-emphasized (like in Etymotics). If you want, you can pick them up, but they won't struck you from the first listen.
The soundstage is a quite a subtle thing. It depends on recording and source ...Denons have great soundstage (and I dare to say, it's best in it's price range) but cannot compare to decent pair of full-sized headphones. It's definitely not only a 3 point, though.
Um, frequency is set to "fun and involving" sound. It has a little boosted bass and low midrange, the rest is neutral for my ear (neither exaggerated nor laid back).
Sybilance is absent (at least on recordings I listen). Anyway, Denons handle it pretty well (after "burn-in" period, fresh from the box, they sibilise a bit).
The cable is great. Thick, yet very flexible and hard-to-tangle.
Based on your musical taste and source, are they good for you ? Umm... Yes but there could be better ones
I've listen to these recordings (you put links in the first post) and frankly, for this kind of music, I'd choose Audio Technica CK7. They're just perfect for acoustic guitar. Denons are very good, although I see them rather in dynamic music with power and impact (latter links maybe?). Audio Technicas have little narrower sound stage, but overall sound signature is better for mellow, accoustic music. They're also headphones with "fun and involving" sound, but little brighter with so much sparkle on highs (but I wouldn't call the highs shrill).
It's hard to tell which will suit you best and hard to tell how much highs is too much for you. It's very personal thing. Therefore I keep both phones and sometimes switch between them
There's a couple reviews of both of them. After a little research you'll know which one suit you best.
BTW, cable on CK7 is worse than Denon's. Very flexible, but tangle-prone and not as thick. But worse doesn't mean bad ... IMO it's typical.