What I could say is both has its good area of presentation. In my system, susvara has more bass quantity while 1266 tc has more quality based. Imaging, TC is better. Sound stage TC is better. If you listen to classical and want a very detailed presentation, 1266tc will be your choice. If you are looking for something relax and musical, susvara will be your choice. Two headphones have very different presentation in every songs, it really depends what you like most. I found 1266 tc is more rational and susvara more musical. You can get most of the details from 1266 tc while susvara focus on the whole picture of the music. I can say is that this a very different style of playback. I enjoy to keep both headphones in my system. However, I think there might have some headphones that can replace susvara in that type of presentation like empyrean, or the new spirit torino ragnarr(heard from someone saying that its a very good one but i haven't heard of it). I think 1266 tc style of presentation is irreplaceable by other headphones, because it has its uniqueness of imaging, which is a very speaker like one.