the fact is that even at 386khz with a 32 bit word length it is easy to hear the shortcommings of digital's attempt to reproduce music compared to vinyl.
just listen.
Yeah but that is all because of the tourmaline hair dryer tweak, which gives Vinyl a massive but unfair advantage!
More seriously, perhaps the K2HD guys either made a mistake or their equipment was faulty or you were getting microphonics from the cartridge or preamp when playing vinyl rather than on the digital devices (no microphonics). Distortion, S/N and other specifications on the type of high end digital gear used should have made your observations impossible provided the equipment was working properly and operated correctly.