Most people who know what they're talking about agree -- LG's OLED's are spectacular, both in terms of picture quality and its ability to handle motion and in terms of input lag if you plan to play video games.
It's the ultimate all-rounder. If you can buy this TV, you should probably buy this TV.
The C8 65-inch has an RRP of AU$6,399. You should be able to get it for cheaper in-store.
TCL is one of those brands that isn't quite as flashy as your LGs or your Samsungs or your Bravias, but consistently delivers high quality images for a reasonable price. The TCL uses QLED Quantum Dot Technology similar to Samsung's premium range, but at a cheaper price.
You should be able to pick up a 65-inch X4US at under AU$3,500.