U2415 black level / viewing angle

Hi forum, first, the suggested information:

* What is the 20 digit alpha-numeric monitor serial number and A0x revision?
CN-0CFV9N-74261-71G-18HS A03
* To what computer model is the monitor attached?

Custom PC.  Gigabyte GA-Z170X-UD5

* What video card/GPU is in the computer?

Onboard integrated Intel HD video (Intel® HD Graphics 530)

* What video out ports are on the video card/GPU or computer?

HDMI, DisplayPort, DVI

* List all monitor cabling attached to the computer and the ports they are using

Existing monitor using DVI, U2415 using DisplayPort.

* What Windows power plan? Example = High performance, PCI-e Link State Off

Linux.  No monitor power management enabled.

* Press the monitor Menu button to open the monitor OSD (On Screen Display). The bottom of that screen should show a resolution. What is listed?

1920x1200; 60hz

* Was the monitor purchased directly from Dell or some reseller?

Directly from Dell.

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So I have a new U2415 monitor, it arrived last week.  Everything is fine with it, except that I'm disappointed with the black level / viewing angle.  I have it angled towards me on my desk, along with my existing monitor, and the far right corner is noticeably washed out in dark screens.  If I center my head on the monitor, it's not as bad, but still there.  

My existing monitor is another Dell, an old 2405FPW which was one of the best purchases I've ever made, and has served me well for over ten years, and it has blacker blacks.  They don't wash out as I move my head left or right of center on the screen, even if I look almost directly across the front of the screen from the side.  I also have a pair of Dell U2412Ms at work, and they also don't seem to have this issue; full screen black terminals look about the same from any angle.

I'm wondering is my monitor defective, or is this just due to the way this particular model is built?  If it's not a defect, I may just return it and look for another.  Maybe I'm being too anal about it, but it's frustrating to have had such good experience with an older Dell monitor and be disappointed after spending the money for newer model.

I've attached a link to the photos taken of the self test screens suggested above, as well as some pictures of the two screens on a Linux console which is totally black, and another of the two screens mirroring my desktop.  It's fairly evident in the photos the difference.  The new monitor is on the right.

For these photos the U2415 was at factory settings and the old 2405FPW was at 75% brightness.