Last year’s Z95A from Panasonic also used MLA, but the new approach gets better results and is cheaper to produce. So the panel is top tier and should be a formidable alternative to the QD-OLED ...
Is it worth upgrading from your trusty C4? It's too early to tell, but at a technical level there are some key differences.
All sizes of the Samsung S90D OLED TV -- from 42 inches to 83 inches -- are on sale from Samsung, with discounts of up to $1,600. You need to hurry though!