Same as from the Guinness gravity bar. Very little.
They have one in Belfast and there is nothing to see there unless you know what you are looking for, i.e. your street, your school, your work.
There's not much there for the unfamiliar.
When I was in the Gravity Bar with work one evening, I asked someone to point out the sights. One of the first things they pointed out, at 10 o'clock, was to look at the large black space. Phoenix Park. Largest European Urban Park. May well be impressive if you are in it but not going up a brewery to look at a dark space!
I'd say the most impressive sight from the Point might be all the railway lines going into Connolly.