For jazz vocals, my favorite is the Mysphere 3.2. The Mysphere 3.2 have captured the emotion of the singer, is the most natural headphone I ever heard, and have really good clarity.
Vocal Jazz I like to listen to is Woongsan http://open.qobuz.com/album/i9402n6nq3sca
Cheaper option would be a classic Audio Technica woody since those are usually warm sounding and vocals are usually forward like the ATH-W10VTG. I wouldn’t say the classic Audio Technica sound is natural, but it stirs a different pleasant emotion when listening to it.
Vocal Jazz I like to listen to is Woongsan http://open.qobuz.com/album/i9402n6nq3sca
Cheaper option would be a classic Audio Technica woody since those are usually warm sounding and vocals are usually forward like the ATH-W10VTG. I wouldn’t say the classic Audio Technica sound is natural, but it stirs a different pleasant emotion when listening to it.