Is the Sharp 4TC75FV1U good for gaming?

It is basic for gaming. The panel is 60 Hz with no ALLM or high frame rate support, so fast console games will not get the smoother motion or low-latency switching that gaming-focused TVs offer.

Does it support Dolby Vision?

Yes. It handles Dolby Vision, HDR10 and HLG, so most streaming HDR content will play in its intended format. Without local dimming or wide color gamut, the HDR effect is modest.

What operating system does it use?

It runs Google TV, with Google Assistant voice control. That gives access to the Google Play app store and the usual streaming apps through the TV interface.

Can I mount it on a wall?

Yes. It is VESA-mount compatible, so a standard wall bracket can be used. Check the bracket's weight rating against the TV before mounting a 75-inch set.

Does it have a headphone jack?

Yes. It has a 1/8-inch headphone jack alongside HDMI, USB-A and RJ45 LAN ports, so wired headphones or a soundbar can be connected without Bluetooth.

Is it a good choice over a mid-range 75-inch TV?

Only if the basics are enough. Rivals with local dimming, wide color gamut and 120 Hz panels will look better for HDR films and gaming, while this set covers streaming and broadcast viewing at a large size.