Your question doesn't make a lot of sense, do you mean to ask if the Sophia is a better speaker or will I gain greater musical performance if I upgrade?
I would pose a question as why you are not considering the KEF 207.2 which is vastly superior in many ways over the much smaller 203.
The 203.2 is a $10k speaker while the Sophia's are $18k. The KEF 207.2 at $20k is a direct competitor to the Sophia and the Sasha.
The 207 is not just a bigger 203 there are of course similarities between them the 207.2 has a warmer punchier lower midrange, due to special mid bass coupler driver, used only in the 207.2. so the differences between the 207 and the 203 are:
a bigger sound,
a richer punchier midrange and midbass,
much more deep bass.
So the question you should ask would be is the Wilson sound better or different than the KEF sound?