I've been anxious to test my display in bright sunlight and i got the chance this morning (it's been foggy for days). I can report that in direct sunlight it was still readable. Not easily, but i could still makeout the brighter pixels with little effort. This is on a Blue Mk2 with the brightness at a little over half way up. Here's a shot of my viewing angle for reference.

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||| 12GB blue
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