I went for the 1266tc first but I'm saving for a susvara
I made the same plan (moving from the Empyrean, to the Elite, then to the Abyss 1266TC), and the Susvaras just came last week. Have you gotten there yet?
I'm doing my first back-and-forth comparison, the Susvara having just arrived last week. They're being drive by a Holo may KTE (one of the most dramatically different and better non-source, non-speaker components I've ever heard.
I am very positive about the Bryston 3.14 DAC, and have loved its performance for nearly a year; however, the May KTE is a whole different category, perhaps due to its unique resistor-ladder technology and huge power supplies - but of course because its a drawing-board design by a very creative engineer.
I had used Schiit electronics prior, and was very pleased with the Gungnir and Yggy....but the Bryston bested them by the same margin, despite the cone national chip-based conversion. All the groove, punch, musical and spatial detail, with far greater transparency. The May KTE is just a different beast, and is really that good. Utterly tactile, texture, force/rhythm, the inner details of the silence and space itself, a richer and subtler envelope of tone, timbre, harmonics, and dynamics. I'm just blown away by what it does for both sets of headphones, even bringing out their unique characteristics all the more clearly.
My impressions of the two sets of headphones are pretty consistent with the reputation. Both first-rate soundstage and image specificity as well as dimension (the obvious way in which the saxophone is heard as a three dimensional thing with complex sound coming through it); tremendous detail retrieval...
...the Abyss more illuminated, leaner (the relatively recessed midrange - satisfying in its full timbal, harmonic palette, but less emphasis on the fat and luxury of the midrange), with modestly deeper and tonally complex controlled, but more impactful bass.
...The Susvara equally detailed, richer, with more attention to caressing the ear with the bloom and hue of sheer pleasurable SOUND...yet, there is nothing emphasized, no inaccuracy or euphony, in the stereotypical sense which risks sacrificing truth and accuracy for extra sugar and fat.There's is a kind of impossible best of both worlds thing about the Susvara, which may make it my go-to by just a slim margin. But, if I can manage to keep them, I wouldn't want to do without the sheer impressiveness and satisfying impact which lends a great mix of palpable rhythm and transparency.