Lenovo Y50 4k UHD white color is really warm (yellowish)

Hi all,
I happen to have a Y50 FHD and a Y50 UHD placed side by side and I noticed the UHD produced dim and yellowish White color compared to FHD version. The panel on the UHD version is Samsung SDC4852.
I am not talking about the fiasco of "yellow being too dark" issue on previous Y50 version, although I know that this second gen Y50 UHD version that I got is SUPPOSEDLY fixed with yellow color issue.
This "warm white" color could be related to bad or insufficient back light but I don't know for sure. So anyone who owns a Lenovo Y50 UHD, please give me an input ?
Left : Y50 FHD
Right, Y50 UHD 4k
Brightness = max level on both screen
Power setting = High Performance
Link to picture/image
Link to picture/image
Link to picture/image
At bootup, the lenovo logo represents true white color/intensity, unaffected by program settings, etc...
 Bootup logo
Mod comment: Over sized pictures converted to links. Please see About-Posting-Pictures-In-The-Forums

Is this forum a fan club or something ? Can atleast one of the moderator / support specialist comment once on any topic that hasn't got any replies ?
I spent the time taking pictures , making the post not to share my Lenovo stories. I want support. At least someone can confirm oh this is how it's supposed to be  or , oh no , it is not ... Simple exchanges like that.

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