How are you using the Wiim Pro? Are you using that as an Streamer + DAC or only the source?
If you are looking at just a source and have a nice/decent DAC - then perhaps not unless your budget is really high, you won't hear a difference. Even then I am not sure as it really depends on what you can really hear - I couldn't hear anything life changing in devices many times more expensive.
If you are looking at a streamer + DAC then you can do a lot better
I tried a bunch of streamers including Auralic, Lumin, Aurender, NAIM and some other high end stuff and a few budget contenders in Bluesound, Cambridge audio (CA) etc.
As a source only, I PERSONALLY really couldn't tell much difference in moderately priced setups - upto under 10L.
However the moment you engage the source + DAC, almost all brands are pretty solid, it will all boil down largely on your preference. Like there was a decent amount of difference between the sound of NAIM vs Aurender vs CA (That I could demo at the same place in the same setup). They all sounded different but pretty good. Surprisingly CA could do things great too, at 1/5th the price.
Yes a fancier device MAY improve SQ, but MAY not. However, it is a joy to look at the screen of something like the NAIM Unity ATOM HP edition, for me that would make the overall experience certainly better.