you've mentioned before that the treble on the sparrow is a bit hot. do you think it's because of the DA1852 chip? On the website they describe the DA1852 as: "Sounds a bit dynamic with extended highs."
Maybe switching to the DA8740 module would make it a bit better? The website decribes the DA8740 as: "Sounds a bit tubelike and soft/warm." Did Kingwa give you a DA8740 to test out?
I don't have the other dac module, I will order it and the dir8416 though. I get the feeling most people will like neutral dac module and neutral receiver, as there is already slight warmth with stock modules, mainly in the bass region, which has a droning sort of quality, but still good impact.