I have an LG OLED C1 65" and the Vision Pro movie experience is nearly the same as the TV, except that you have to deal with all the lens glare in the Vision Pro, which is a big downside. An upside is that films like Encanto are in 3D, which looks really good for Pixar/CGI movies and pretty garbage for every other movie I've tried in the headset (for me, real films with 3D look like paper cut outs layered over each other and it's very distracting and looks lame).
But a nice 65" OLED TV is still cheaper than a Vision Pro, so I can't recommend it unless you are in a situation where you literally cannot put a big OLED TV in your space, or you're desperate to take your OLED TV with you on flights.
I also have a Quest 3 and without OLED for true HDR, it loses right away, and then it loses further on resolution. Audio quality is really good on Quest 3, but... If I really wanted to use a headset to watch a movie, I would use the Vision Pro, hands down. If I only had the Quest 3 on hand, I wouldn't watch a movie.