SINAD is worse than Denon indeed, but Onkyo appears to have HDMI 2.1 ports that work well. That's apparently still problematic on the Denons. Perhaps when Denon releases the X*800 range of AVRs later this year, it'll be fixed, but still problematic on their current X*700 range (e.g. X3700, X4700). And, well, the Onkyo has Dirac Live
For movies and such, I'm not too nitpicky about SINAD and the utmost fidelity anyway. For music I am, and I have a dedicated streamer with integrated DAC for that, with a SINAD in the 110db+ range. As well as a Purifi poweramp, also in the 110db+ SINAD range, arguably above the range where most human ears can't hear a difference anymore (though some say it's 120db+).