I have a feeling the M5HP is an upgrade over my M80v2 particularly since I am now taking full advantage of the family of curves (I am in a 4800 ft^3 reflective room in the far field). I use a sub (EP600v2) as well. Maybe I will never know.

I'd be curious to know after some extended listening to the M5HP if you find yourself wanting to swap out the M22 for M5HP in your other space. I listened to the M22ti and couldn't stand it. I know you have the M22v4.