Screen uniformity on new 27" iMac

[PC1967]

Hi all - I just received a new 27" iMac, and the screen quality seems quite poor. There is noticeable darkening and yellowing in the upper left corner of the display. Below is a picture of the screen taken in a dark room with my phone (the photo's brightness has been reduced to show the issue).

Is this typical of the new iMacs, or should I send this unit back? My previous 2 27" iMacs (non-5k) have much better display uniformity.

 

[MBHockey]

I do not have this issue on mine. Out of curiosity, where did yours ship from? I remember reading some anecdotes suggesting that ones shipping from California were 'better' than those shipping from china. Mine originated from Fresno, CA. Either way, you should just return/exchange it.