Just make sure that the 8ks are properly set up:
1. get a clean power supply dedicated to the system so that other domestic stuff does not introduce noise.
2. use an outstanding source such as an 808.3 or ID40, and put it on a good isolation platform.
3. move the 8ks well clear of rear walls.
4. move the 8ks well clear of side walls.
5. sit central to the speakers, well clear of rear walls, and the same distance from each speaker as they are from each other.
6. be obsessive about speaker toe-in.
If you still feel the urge to upgrade / have the latest new thing then spend the money on a therapist or you will never be happy. 8ks already cost a fortune so why feel the need to spend more?
To be insufferably smug, mine are set up as above and sound wonderful. Final toe-in adjustments after the speakers had run in / burnt in (yes, I hear the objections) made a surprising degree of difference.
Point "3" seems controversial to me at least.
If seated with back near back wall, almost most speakers do sound not so good. The reverse, with speakers near wall but listening position clear off any wall at the back, seemingly sounded way much better.
As for all the rest of the points, cant agree for more. Toeing in will be to choice of speaker placement (how far apart would necessitate the need - more or less toeing in).
I tried the toeing in, but in the end, choose to have it straight facing the front. Maybe its because I have a small listening space to warrant the effect.