Monitor upgrade / emulate Retina

I want to upgrade my monitor, with 32" 2560 x 1600 / 32" 2560 x 1440 / or 4k 28 inches 3840 x 2160
One of those should be :

http://www.newegg.com/Product/Product.aspx?Item=N82E16824260132

http://www.newegg.com/Product/Product.aspx?Item=N82E16824014372


The monitor i have now, is BenQ GW2760HS / res. 1920 x 1080
Do you think, the fonts, generally speaking, would look better / sharper / crisper, on 2560 x 1600 / 2560 x 1440, or 4K 28 inches,than 1920 x 1080 ?
I tried everything possible, on my 1080p monitor, but i don't really like the way the fonts look like. They look blurry. I googled a lot of forums, about. But still no result. I tried with the commands "defaults write -g AppleFontSmoothing -int 1" 2 /3 / 4 / as well, but the fonts still looks blurry.
Could you advice me, please ? What monitor would you recommend, to have a close / same / quality, like Retina Display - 15 inch ?
What about the 28 inches / 4k displays ?
I wonder how the fonts look on 4k display. I don't mean the font size, but the quality. Are they getting close to MBP Retina Display ?
How are the fonts looking on iMac 27 inches / 2560 x 1440 / ??
Are they looking better than 1920 x 1080 monitor / Hackintosh ?
If i would have a monitor with 2560 x 1440, would the fonts looks same like iMac 27 ?
As you can see in the attached image, there are 3 displays / comparisons
1. 15 inches / 16:9 / 2880 x 1800 resolution ( MacBookPro Retina )

2. 28 inches / 16:9 / 3840 x 2160 resolution ( 4 k monitor / 28 inches )

3. 27 inches / 16:9 / 1920 x 1080 ( specs for the monitor i have now )

For the 15 inches, there is 53.921 pixels / square inch
For the 28 inches / 4k / there is 24.784 pixels / square inch
Less than the half
That's why i asked you if the 28 inches 4k monitor is getting close to the Retina quality
All i want is to improve the fonts quality. Whatever i'm doing, OS X fonts looks blurry, compared to Windows fonts.
Thanks in advance, i hope someone can give me some advices about

lliyama prolite xb2779qs-s1

This monitor has the same specs as in apple cinema display (has identical panel IPS and the same specs).
But not well calibrated compare with apple cinema display.

What about 32 " ?

NEC PA302W 30''
Professional monitor for work with photos, or editing movies, but this monitor is very expensive, if you really need 30" /(not the 27") it is the last choice for professioanal editing.

Also, Eizo FlexScan EV2736WFS another one 27", and NEC PA242W, EIZO ColorEdge CG246. These monitors are matte not glossy.

ADDED: the best choice is professioanl NEC PA272W for price/quality

I went last week to an Apple store, and i saw the iMac 27" 5K.
Amazing, but too expensive.
Do you think that Dell UP2715K monitor ( same inch / rezolution - 5.120 x 2.880 ) would look the same on hackintosh ?

No ideas, guys ?

I would presume the Dell's 5k monitor would be very similar to iMac's retina. But keep in mind the UP2715K needs 2x DisplayPorts to get 5120 x 2880 at 60 Hz.

Thanks.
GTX 970 Gaming G1, should be okay ?
http://www.heise.de/preisvergleich/...-gaming-g1-gv-n970g1-gaming-4gd-a1167952.html

Which setting do i have to do in OS X, to have the Retina display, actually ?