I think the Diesis is a good choice, the Caput Mundi has 12” “woofers” and while you won’t get the same visceral punch as the Wilsons, and maybe not go quite as deep, absent the typical bump @ around 70 hz of the Wilson’s, you’ll get more tuneful, natural sounding bass. Giuseppe is a real artist and I think his speakers get to the beauty in the music much better than many. I think the smaller models you may not get bass near what you’re used to with your Wilsons.
And yes, Diesis speakers setup easier than most. They are not recommended to be toed-in more than 20 degrees, so almost straight forward.