Holo DACs while use a ladder for conversion (not really R2R), sound more like Delta-Sigma, reviewers prefer to compare with DS DACs like Chord, not a real R2R DACs like Denafrips, Audio GD, Rockna, etc.
In fact, on a level of musicality, true harmonics, natural sound and a long-term fatigue level any Holo DAC is placed next to the best DS implementations. And similarly, it require upsampling on the PC to the highest numbers. I didn't hear R26, but based on the feedback on this forum, PCM sound characteristic is close to the Audio GD DAC which I own and love for two years or so. It is not my first R2R, I am quite a veteran, while it is my first NOS. I have never accepted DS for music. I can say, if you like R26 sound you will listen to more music you ever did before.