Can somebody comment on the experience between transitioning from 4.8 to 5.x? I didn't see any massive advantage, and the performance of my native UIs, after p

Can somebody comment on the experience between transitioning from 4.8 to 5.x? I didn't see any massive advantage, and the performance of my native UIs, after porting some large projecs, were negatively affected on both Linux and Windows (that is, qt 5 added significant overhead without any user-facing benefit). I don't know what to think about QtQuick/QML, I feel like I see no significant use for them. It sounds nice to be able to push dumb logic into the UI, but then again UI and code are often tied together to the point that there's a limit of what can be done without becoming a state synchronization burden. It's also slower, which brings me to my first point. Even though Qt5 has polished some edges, the project being based on 4.8 "rings home" to me.