Blurred fonts on external 1080p display

I have Samsung S24C650PL 1080p (connected with HDMI), which I bought one year ago. I used it a lot with Windows without any issues. Two weeks ago I bought my first Macbook Pro Retina 13 with Yosemite and since than it is a pain to use the external display.
All fonts are significantly more blurred than with Windows. It very unpleasant.
Especially scanned PDFs are horrible, very difficult to read, much worse than the rest of the system.
What is, however, really weird, if I move the Preview app with the PDF from the internal display to the external, it shows the right and sharp image for cca one second before it becomes blurred. So it is obviously software-related issue.
What I tried to fix it:
Deactivate "Use LCD font smoothing when available" --> no effect at all
Deactivate "Smooth text and line art" --> no effect
Use any possible settings in "Displays" --> no effect
Call the Apple support and talk with them for 40+ minutes --> no effect and no help
As last hope, I tried "Force RGB mode in Mac OS X to fix the picture quality of an external monitor" (see http://www.ireckon.net/2013/03/force-rgb-mode-in-mac-os-x-to-fix-the-picture-qua lity-of-an-external-monitor) --> no effect
What is even more weird, if I use Parallels with Windows, it is okay! Even in the a window and not in fullscreen, the Windows show everything just as they should - crisp and sharp lines and fonts, while the background in OS X is blurred.
The unique "workaround" I found is related to PDFs and their readability.
Installation of Acrobat Adobe, which uses obviously a different rendering engine than Preview app. (However, I don`t like the app.)
Installation Foxit Reader for Windows under Wine (even that is much better than Preview app.), however, it has its own issues.
However, I don`t have any workaround for the rest of the system... and I just don`t know what to do...
I would appreciate any help. I do like hardware from my new MBPr, but I am pretty frustrated from bugs of this kind...
Jan

I'm not sure if my problem is related, but I'm also connecting my MacBook to a Dell LCD panel via the mini DisplayPort-to-DVI adapter and I'm getting weird on-screen artifacts and intermittent flickering.
There's a known problem if you're using the mini DisplayPort-to-VGA adapter and Apple has provided a firmware update to fix the problem. If you're using that (and connecting to your Dell monitor via an additional VGA-to-DVI dongle, then you might want to grab the update.
But as far as I know, there doesn't seem to be a solution for the DVI adapter.

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