It REALLY depends on the child
Was speaking to a friend about this exact thing
Attempted it with adults outnumbering 1 DC (2 of us) with child who sits fine for restaurant meals etc, get comments on how well behaved tc .. tried cinema film they loved (think safe bet big Disney movie U Rated).
Fuck me what a mess
Up and down about 10 times for loo, even taking turns was nightmare as loos were miles away
Jumping until being told to sit still, it lasted about 2 min until next ants in pants
Get to the first trailer and then kept saying every 5 mins "home now??" Loudly
Then throwing a tantrum because popcorn ran out, never seen anything like it
We never leave cinemas early but we seriously were about to just cut our losses before DC calmed down halfway through because it wasn't fair on other families, some were very loud but ours was unacceptable
Then movie got to a dark bit and DC started shouting "scared" and refused to look at the screen for a few minutes
And so on
No one enjoyed it, awful expensive day out and I was so naive, thought it would be fine!
Tried the same thing 18 months later, was great. Much more patient, understanding and only 2 loo trips, what a difference a year and a bit made
Friend reported similar with her younger DC at that age, while her older DC has always been fine/patient and didn't get scared of the dark etc so often went with 1 parent