Problems with iMac retina 5K (artifacts, glitches and etc.)

Hello dear Apple.
I have bought new iMac with retina 5K display and I have found lot of problem with it. It was December 2014 when I got my first iMac. And after then I have found few real problems with it.
The first problem is I can't open high resolution image with standard Preview.app. I mean 'high resolution' - more then 30-40 megapixels. When I open them, I can see image, but only 2-3 seconds, and after that I see horizontal artifacts only. I can't open images, like this Rembrandt.jpg; Carpaccio.jpg; Holbein.jpg
The second problem, when I change resolution in to scaled mode (System Preferences/Display) for increase image on display. I found when select some area on background of desktop it has left some lines after itself. It is particularly unpleasant if you have plain colour desktop background. You can view, how does it look here.
The next problem with animation in different parts of interface, e.g. sometimes when I open Time Machine some parts of windows are freezing or appear some artifacts or glitches near borders of window. And I have the same situation, when I open Mission Control, or any Adobe app or other, or simply rename a files. I have found few discussions with problems like mine, but in the separate places
5K iMac - bad GPUs?
Graphic Problems with Retina iMac
iMac 5K and indesign glitch
And after that I want to tell you that I have this problems on four (4) iMacs. It was really difficult to arrange four replace. I have lost a lot of time an spent a lot of nerves for discuss and resolve my problems with Apple support. Finally, they told me that they do not know about problems with iMacs, and they could offer give my money back. I glad to get my funds, but now in my country price for iMacs has doubled. And if they refund my money, I can buy half new iMac only.
I am sorry for my language and style, but I do not know what I should doing with that. And should I hope, that my problem resolve with OS X updates? Or it is hardware problem of the whole iMacs 5K...

Yes Ralph, absolutely correct, 4 times. Do you have the graphic card the same as me, or m290? Could I ask you check your iMac for few things, please?
For the first, can you enlarge scale in System preference/Display and install plain dark color desktop background. Are there any footprints after rectangular selection like in my video https://youtu.be/dBglFvjJx1Q?
And for the second, could you download this image https://upload.wikimedia.org/wikipedia/commons/0/07/Rembrandt_Harmensz._van_Rijn _-_Nachtwacht_-_Google_Art_Project.jpg  and open in plain Preview.app, and zoom it? Are there any glitches?
Thank forward.

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