Hi Gordon,
I have an OLED65E6P (2016) model which was one of the last TVs made with 3D. My TV is professionally calibrated. The least impressive picture on this TV is from Directv (cable/sat broadcast in general because of compression) and the most impressive is Netflix Dolby Vision programs (Marvel series like Daredevil, Iron Fist, Luke Cage, ...). After DV, Bluray looks fantastic on this TV. As of now, I don't have a 4K BD player,, but I,m sure it looks great on this TV. 3D is at a different level.
You'll be very happy with this TV. If you can find a calibrator, it will look much better. My calibrator came from Dayton, Ohio and he is one of the bests in the States (Chad B).
You can see the TV in my signature link.