The truth is that, being comfortable and well-designed headphones, the Denons have a frequency response that, for me, invalidates them for listening to classical music, where tonal balance and neutral response are essential. The loss that occurs between 1 and 3 kHz makes orchestral music sound veiled, as if behind a curtain, and with an unrealistic timbre. Since this is the genre of music I listen to most, the switch to the Anandas, much more correct in this respect, made me forget the Denons.
In other musical genres, and especially with recordings with excessive energy in the treble, the Denons, sometimes, perform better. They stand out for their low distortion, very present bass (obviously) but vocals are also affected by the drop from 1 kHz. Of course, the sibilance is almost non-existent in the Denons.
The soundstage plays in favor of the Ananda, logically as they are open. They also have their shortcomings: in particular a response from 3 kHz more accentuated than normal (my reference for a frequency-neutral response is the Harman curve with the low frequencies flat below 200 Hz), also a little more distortion is noticed than in the Denons, especially in high mids and reble. As for the timbre, the excess of treble detracts from the realism, but much less than with the Denons.
In the end, it's all about reaching the best possible compromise, and in my case the Anandas work better (or I tolerate their shortcomings better) than the Denons).