A well-written review, I think. I wish more DACs would embrace high bit rate I2S input over HDMI. AES and USB are such silly and/or technically broken formats.
The clearly-heard difference between the K50 and OLADRA is nice to know .. in the digital world there always seems to be room for dramatic improvements. Can't wait until we get some trickle down of this tech to the less-ruinously-priced gear.