Just an update, I returned the model with the screen I posted. They looked at it for 5 seconds, then the genius turned to the other one and just said "it has the dark spot issue." They gave me a new one, which upon turning on turned out to have some kind of bright white line coming out of the lower left corner of the display. So, we did another exchange. The Apple Store employee was cool and understanding, saying "I'd want mine to be perfect too."
Third time was the charm, no significant light bleed or darkness. Although it shows poor QC, this is why I continue to buy Apple, the excellent customer service.
And for anyone interested, I have the 13" ultimate, and all three units I received had the Samsung SSD and Samsung screen.