Yes, actually - mine (on a 8-core) seems a touch blurry. Definitely worse than my 2016 MBP.
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Ok - so I did some playing around here:
If I open FaceTime, image is somewhat blurry.
Close FaceTime, and open Photo Booth. Picture in Photo Booth looks great - much sharper.
Now while Photo Booth is open, open FaceTime next to it. BOTH images (photo booth and FaceTime) now are more blurry.
Close FaceTime. Photo booth remains blurry.
Close Photo booth. Start Photo booth again - now it's nice and sharp again.
Completely repeatable. Not sure what's going on there - but it suggests it's a strange FaceTime software thing, as opposed to a bad camera...