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Also question is, what is retina resolution?

Retina Display is a marketing term developed by Apple to refer to devices and monitors that have a resolution and pixel density so high – roughly 300 or more pixels per inch – that a person is unable to discern the individual pixels at a normal viewing distance.

Likewise, is retina better than 4k? Retina displays have little to do with the resolution. It's just a resolution where at eye level you won't see any pixels, while 4k TVs (really UltraHD, because they're 2160p tvs not 4k tvs), can show pixels if the TV is large enough.

Consequently, what is so special about retina display?

The Retina display uses a pixel density of 326, which Apple contends renders the pixels invisible to almost all users. The result is a higher quality image with smooth lines, easier to read text and an overall higher resolution. Apps designed with the Retina display in mind offer better and cleaner user interfaces.

Is the Retina Display worth it?

The retina display model had 256GB of flash storage and 8GB of memory, while the regular model had a 500GB hard drive and 4GB of memory. The bottom line: If you're a professional photographer or serious amateur, the extra $400 for the better retina display is probably worth it.