I wanted to check things out for myself early last year and bought an LG C1 77" and XBOX Series S. I then upgraded my Sony UBP-X800 to the Sony X800M2 for Dolby Vision support. "How much better was the upgrade from a lower tier Samsung LED 75" TV to LG OLED?" you ask. Well...

The C3 improves on the C1 and C2. There was a learning curve going to LG and there are some things that bug me but picture quality viewing 4K Dolby Vision content is not an issue. While the XBOX Series S renders in 1440p, it can output video in 4K @120Hz and games played in 4K HDR @120Hz will produce images on an OLED TV that will blow you away.
The big issue if one is using a Marantz 6012 in between devices and the TV is the lack of HDMI 2.1 support and it will cap video at 4K @60Hz. Game consoles, Macs and PCs that support 4K @120Hz will need to be connected directly to the TV and use eARC for lossless multichannel audio back to the receiver. The 6012 was supposed to receive an update to enable eARC but how well it works with a given TV will vary from setup to setup. But, given the choices in the list above, that TV would be an LG C3 if I was buying a new set. Perfect blacks and wide viewing angles can't be had by LED sets. Oh, and get the biggest TV you can afford and that will fit in the space. Bestbuy and Costco currently have the LG C3 65" TV at $1,599.99. Bestbuy purchase comes with 3 months of Apple TV+ and 1 month of FUBO. Costco's price includes additional coverage charged at $99.99 and then immediately credited at $100 at the counter. My TV also had a $100 credit from LG for selected outfits and I applied it to my Microsoft account for gaming. I'm not sure if that is also included with the C3 purchase at Costco.