Upgrading from Wilson Sophia 2's?

Madfloyd you may want to look outside the Wilson line. I'm afraid that is the Wilson sound. As you move up the line you get more of it. Some people love and some people don't.

I would look in this order.
Verity audio will give you the bass impact and the best midrange going. Super easy to drive.

Magico they get better the more time you spend with them. Takes a bit to get use to them. Not the same bass impact as the wilson.

Rockport with the right room they are very good. side firing woofer makes them though to place.

Vandersteen Maybe the complete opposite to Wilson.

I find that the Wilson sound is anything but bright. If anything, the sound has changed from the WP6 days to a more rolled off highs. But... tweeter ear relationship is critical and the Sophia's don't handle that relationship well as they are not that adjustable. My Maxx IIs have the ability to adjust the head tilt & hence tweeter directionality. I can hear the difference between 2 positions of adjustment instantly (I think there are 14 positions) with ease. Based on your room size and current used Maxx II pricing they are a steel for an upgrade.

I have heard many a different speaker and many have sounded bright and hard at times. But they all benefit from proper tweeter / ear position. Unfortunately not all speakers can do such adjustment but many do compensate with adjustable tweeter outputs.

Now, I use tube amplification which might have something to do with my preference for the Wilson sound (but I doubt 100%, as I have used very high end SS amps with great results) and I find most Be. tweeters to be bright (or hissy) sounding (as a few others have agreed). You will need to let your ears be the judge.

I had tried some Focals and decided that the Be tweeter is not for me (didn't sound natural to my ears).

Dave- i agree that diffusion is necessary for a good room, but what you list won't do the trick.

i would also agree that dead rooms are too be avoided, and have commented on "absorption"-based rooms in the past. i think a good mix is in order (and what my room is doing)

but a lot of stuff you list is reflective by nature...not diffusive. i was also looking into the drapes route, but the thick "stage" type drapes aren't very aesthetically pleasing that are used to absorp sound. i am going to use fabric blinds backed in vinyl groovers for a more diffuse style (i have a wall of windows to contend with on the left side)

a lot of the room is its size/proportions---i'm unlucky and have a more squarish room which requires more work. if your room is more the "golden ratio"---then more power to you! i am jealous....and if 10 years down the road have a large house, will search for one with dedicated listening room in almost perfect ratio.