Also always compare amps in stereo mode with the subs turned off while running speakers full range aka 'direct' mode on your Denon. Also orchestral music is good to differentiate men from the boys. Best of luck. Let us know the jury's verdict.
The increased headroom should make watching those action flicks smoother even at moderate volumes. Less strain on your amps and your ears. There should be more punch and sounds should be more defined esp tracks that have lots of bass energy. Intially it might seem like the separate amps didn't...