Ok, I have tried it out now. Haven't yet properly sunk teeth in, but have a good look. It looks really solid. My complaint about lifestyles wasn't waranted, they work fine and you can switch between most of them, though I do worry that this might create "meta builds". Also I was mistaken, there are practically no EU4-ification. Schemes at worst can resemble the dice roll sieges, but that was basically the same in CK2, except now there is a UI element to show this. Otherwise the game seems like CK2+, just a general all-round upgrade along with new stuff.
But there is one niggle. The UI feels bad. Maybe I was too used to CK2, but the new one feels bad. It's too spread out: character, dynasties, religion and culture in one bottom corner, currencies in the opposite top corner and all the rest important panels down from there. I guess I'll just have to learn to use the hotkeys, but why the hell couldn't it just be all together in the bottom with the character, or the same as in CK2 - at the top, like in every single other PDX game.