Is the S95F worth it over the S90F or last year's S95D?

The S95F adds a brighter panel and a 165Hz refresh rate over the S90F, which matters most for gaming and bright rooms. Against the S95D, the gains are smaller, so a discounted older model is still a reasonable pick if glare is not a problem.

Does it support Dolby Vision?

No. Samsung supports HDR10 and HDR10+ but not Dolby Vision, so Dolby Vision content plays in HDR10 instead. The picture still looks strong, but rival OLEDs handle Dolby Vision.

Is the matte screen a problem in a dark room?

Most reviewers say it is fine, but the matte coating can make blacks look slightly less deep than a glossy OLED in a dark room. In a bright room the trade-off usually favors the S95F.

What refresh rate does it run for gaming?

The panel runs up to 165Hz, and the HDMI 2.1 ports support 4K at high refresh rates with variable refresh rate and auto low-latency mode. That makes it a strong match for current consoles and gaming PCs.

Should I worry about burn-in?

OLED can develop burn-in from static elements like logos and tickers over long periods. Vary content, use the screen-off and pixel-shift features, and avoid leaving a news channel or game HUD on for hours.