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Unfortunately false, the iPhone beats Samsung (although by very very small amount) in screen to body ratio. Plus the iPhone has no chin, or bar across the entire top.
The iPhone X has a 82.9 % screen to body ratio. The screen to body ratio of the S8 is 83.6%, S9 is 83.6%, S9 + is 84.2% , S8 + is 84.0. So as you can see they all have a higher screen to body ratio than the iPhone X/Xs despite having a chin and top bezel.

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https://www.displaysupplychain.com/...ghest-screen-to-body-ratio-and-a-lower-price#
 
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