Having the dedicated amp has really helped for music for me. If you say 90% is movies for you, you may not see as much difference. My 80's really sing now. For movies, especially ones with lots of dynamic action and explosions I've noticed some difference in the impact.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85