For me, the biggest change is the memory usage. But if you don't see that as a problem, you may want to stay where you are, at least until Qt catches up.
(If you do want to upgrade to the latest and don't want to compile Qt yourself, you can use this PPA: sudo add-apt-repository ppa:beineri/opt-qt-5.12.3-bionic . Do remember to use it when doing the cmake.)
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