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The screen from Halo Reach is literally tunnel vision. More of your screen is obscured. While you can still "see", there is more being covered up.
Halo 5's ADS while obstructed completely on the bottom, covers less of the overall screen.
Just for future reference, I don't particularly like ADS even aesthetically. I much prefer zoom. I am willing to give it a shot however.
I think the key distinction is, the Reach screen darkens the area around your target, with an impact to peripheral vision. The effect is to highlighting your target. ADS actually obscures the target, especially if the weapon has any recoil or muzzle flash. The impact on combat clarity is very different.