Haven't really found any videos with Asus Sonic Studio or at least in similar game.
There's vast differences between sound engines of games and if that source material is different in quality and style it makes comparing actual binaural simulation hard.
Just like trying to compare headphones without listening to same music.
Basically when trying to find videos with that Sonic Studio there's just marketing stuff and then Sonic Radar hype.
If Sonic Studio's binaural simulation works well would expect to have people uploading videos to Youtube.
D/A conversion wise SB Z and Strix Soar are at same level.
Strix Soar's TPA6120 is beefier than SB Z's headphone output, but beyond that it's harder to find data.
Strix Raid Pro which should be same card + external volume controller gave
100 ohm output impedance in this test similar to some earlier Xonars.
And while such output impedance wouldn't be problem with 250 ohm Beyers low impedance headphones would have seriously compromised damping factor.
Anyway SB Z is known to work with 250 ohm Beyers and K702 won't require that much voltage.
But with very little actual information from that Asus software hard to say what kind difference there would be between SB Z and Strix Soar.