well the iray is good on antialias some shapes reflection and visible worse on other...
i'm sure iray has some setting that do the same for the quality of the image lowering of course the speed.
btw... i'm not sure... but isn't iray a gpu render? while hybrid is cpu/gpu of course slower but more complete and able.
here is my try with hybrid.....
luxtest02 path max depth 24 lowdiscrepancy 24 gaussian default

luxtest02 metropolis 24 rest default gaussian default

this is for who have some input on how to make better look the image, maybe Dade you know for sure a better setting.
Edited:
if i would add some tiny bloom, almost imperceptible, i would got a perfect image without to blur it to much...