It's great to get the approval to upgrade, but be careful that you're upgrading for the right reasons or you may be chasing ghosts. Your speakers I would say are very capable, even for largish rooms. As others have said, you need to make sure as well that you are comparing apples to apples, starting with loudness.
- Download an SPL meter for your phone and use that to measure the SPL wherever you are sitting. It doesn't need to be at exact listening, but needs to be repeatable for all conditions.
- REW is a great way to measure and visualize the frequency responses of the speakers, either individually, in pairs or summed, and for any variable you want to throw at it. I am doing this now as part of my auditions for a budget speaker for ATMOS. I am running it as main, and trying with/without room correction, grille on/off, toe in/out, raised/level etc.
System 5.1.2 :|: Marantz SR6013 :|: Vizio Quantum 4K 65" :|: Emotiva T2 :|: Ascend CMT 340 SE C:|: Ascend HTM 200SE Rear Surr :|: SVS SB4000 :|: Dayton B652 AIR Front Height