S7+ looks grey to me with ambient lighting. Not good at all. Great in you have lights off though.I have taken some pictures to illustrate. With and without light (it's almost 1pm here). The only thing I have without a screen protector is a 14in USB C monitor from lenovo, which I connected to the 11in pro (the TAB S7+ is on the right). Honestly, even without a screen protector the monitor is not dark because of reflectivity....
Also the angle combined with the light makes the screens look more greyish, if you look in front of it, it's darker
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By the way this year Samsung will be launching in addition to the TAB S8 and S8+, an S8 ultra which will be 14.6in, exactly the size of this Lenovo monitor if you turn the chin into screen (92% screen to body ratio), with a huge 46wh battery and, the crazy thing, is that it will be lighter than the 12.9 iPad pro at 650gr....
I doubt s8 ultra will be 650g. Not sure how adding over 2inches to the screen will only add 60g in weight.