I had the same question about the Playback Designs DSD DACs - where would they fit in the comparison if a PD ADC was available ?
Well the PBD is the best DSD DAC I've ever heard in my system, so hopefully if Andreas were to create an A/D, it would certainly better the Merging Horus and have the listenability of the Meitner. It is true to the source and it is also musical. It doesn't quite have the dynamics of the Grimm, but it's close. Another DAC I've had in my system now for a couple of weeks is the Lampizator DSD. On some material, I prefer it over the PBD. I'm sure if it had the upgraded caps and tubes, it would certainly surpass it.