I think the larger size will be fine, because the whole space is large and high.

Did you mock it up? Really easy to cut some cardboard to size and hang it from your current chandelier.

I think once you hang it, you might want to move the art to the other wall, so they don't compete with each other in that long view of the space.

Larger fixture.

the larger looks fine, but I would lower it a bit.

I'd move the framed art to the stair wall and get a tall vertical piece for the sloped wall.

This is why a rulenof thumb should not be an iron rule. Context is everyhing. That rule works well in an enclosed room with average height ceilings. Your large open space and very high celings call for the larger size. You made a good choice.

Please post an updated picture once you hang the light fixture.

There is no such thing as too large a chandelier.

Hung lower either way.

That fixture doesn't fit the modern/contemporary style of your home. The light should be directed down over the table not up towards the ceiling.

You should have selected the version of the wall art that was the square format to take advantage of the height of the room.

A vast variety of fixtures that could work in the space.

This is the light, yes? Answer? No : )

A huge amount of money ( even at Loews ) for a light, difficult to make look good on a slope. Too glam for the furnishings and aesthetic.

Something lighter looking, and one that hangs with an available pivot from a small box cover. : ) Not this, and it isn't the size.,,,,,,,,

Unless....... you are showing a listing photo and those are not your furnishings.

Make certain you choose one with enough wire/stem to allow for hang from 14' ( 168 " ) as even with 36 " hang from bottom of fixture to table top, you need 102" of wire/stem

You will need a light that is adaptable for a sloped ceiling but IMO a very fancy light for a not to me contemporary style ever with a banquette I do agree the right fixture can break all the RULES

Your fixture doesn't appear too big to me. If anything it might look a bit small for such a large room volume.

Like Jan mentioend you have to make sure the fixture comes with long enough wire, cable, stem to be the correct distance from the tabletop. It appears the wire length for this fixture is 72 inches. Do they offer longer wire?

Lenghtening the wires on a fixture is pretty elementary. They sell all the parts of not a kit and any home improvement store.

The MOUNT on that light will look horrible on a slanted /vault ceiling.

Juxtapositions are great....just not that light with those furnishings, perhaps.

Good point about the mount plate. It is going to call unnecessary attention to itself when placed on a sloped ceiling.

I sure would not choose a fixture with a mounting plate like that for a sloped ceiling. Getting the wires adjusted so the fixture is level would be a nightmare for one and what chispa said about it calling attention to itself for another.