Sounds like your gamut and black levels are wrong. I don't know about Panasonic's, but if there's an AUTO setting for gamut, use that. For black levels, it depends on what you set for the video card, but the display needs to match that. If blacks are crushed, then there's a mismatch.
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Henry | LG OLED65C7P | Denon AVR-X3500H | ELAC Uni-Fi x7 | ELAC Debut 2.0 SUB3030 x2 | NVIDIA SHIELD TV Pro 2019 | Plex
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