It's important not to confuse implementations and settings with the underlying technology. Experts and purists will tell you to take a good TV, start with Dolby Vision Dark, and tweak from there. If you do those three things, it's beautiful and not oversaturated at all. And as a side note, the Dolby Vision implementation on an older Hisense U6G I bought for my parents a few years back was actually dark and undersaturated, no matter what settings tweaks I made. I literally disabled DV for that reason, and so did lots of other people. Shockingly, even plain SDR was better on that TV.
This. My A95L is stunning. Does it cost a lot more than the S90D QD-OLED from Samsung? Yeah. But if you can afford it, it's amazing. If you watch any SDR content, Sony's image processing and SDR peak brightness make a big difference. The Sony is also significantly better at motion handling, although whether that matters to someone and where they stand on the motion handling holy war is a personal preference.
FWIW, I bought an LG C4 for my parents for Christmas instead of an S90D when the difference was only a few hundred bucks.
I may sound like a Sony hack, but I'm not. The A95L is just hands-down the best. And I may sound anti-Samsung, but I'm not. I have the Q990C soundbar and a Samsung range. (I despise the range, but that's another topic altogether!)
Also, keep in mind that sure, Disney+ is adding HDR10+ support, but there is a TON of other content that isn't in HDR10+.
It still befuddles me that Samsung won't pony up to add Dolby Vision. The S90D is a great TV, but I have to imagine that the people who have read up on QD-OLED technology certainly know what Dolby Vision is.