Good luck finding someone who heard both but your already using tiny high quality speakers, not sure you’ll gain anything with those odd eye 👁 looking speakers 🔊...
Looks like kef62 turned into a circular speaker
I’d probably stick to 3ch your currently using , maybe try’s and find owners of this “ Devialet Phantom Gold “ for there opinions and reviews .
What are your room dimensions . I’ve seen people fit 7ch system inn small rooms , so it’s more less your decision if you watch enough movies for surround sound .
Your Sonus look ultra high end , I’m not sure if those 6.4k speakers are better or not .. you’d have to hear them to say , if free listening is possible.
2-3ch is fine just no 3D sound effects .