Here\'s a QML file that has a Dial control and a custom shape side by side:
import QtQuick 2.9 import QtQuick.Layouts 1.3 import QtQuick.Controls 2.3 import
Have you tried enabling smooth? I would check but i am currently using Qt 4.8 for a project and do not have 5.x loaded to try it for myself.
https://doc.qt.io/qt-5.10/qml-qtquick-item.html#smooth-prop