Between the 950G and Z9F, I'd lean towards the Z9F unless you are looking to save money. I do prefer Sony over Samsung due to their overall approach to picture quality, processing, and motion. Out of the box cinema settings are more accurate.
Have you looked at the A9G?
FYI the Z9G comes in starting at 85" model and is like $12k.
Sony XBR-77A9G / Panasonic DP-UB9000 / Marantz SR7011 / Def Tech 9060 Series