If only to prove someone's reading your posts
I'll say that the Mini 4 is essentially identical to the Air 1 and Air 2 displays in every respect other than surface reflections. If your Air 1 and Air 2 were way better, you really lost the display lottery.
Maybe you lost me in what I was trying to convey; my mini 4 screen is the best I've seen compared to an Air 1 and mini 2 I own (of course we know way different than mini 2 screen), and way better quality overall compared to two air 2's I bought then returned with screen issues.
I have a perfectly calibrated 22" 1080p PC monitor at about 6600 - 6700k color temp (do not like to warm or yellow) and has perfect 100 percent srgb color accuracy and can display black and white or grey contrast with no dithering to 100 percent. It's an EIPS 2015 made panel. It's what I use to match or calibrate any other device/screen/tv to.
In that regard, the new mini 4 with its 7.9" mid 2015 made panel matches my awesome PC panel really well compared to the over saturated Air 1 and Air 2 screen. Although Air 2 screen is better than Air 1 screen.
Only diff on mini 4 panel and my PC monitor is color temperature which is still cooler (blueish white) on mini 4 which I am guessing is around 6800-6950k color temp. And it displays 98 percent srgb color values and about 90-95 percent of black and white and gray contrast with no dithering.
So if you want a portable wireless remote monitor/viewfinder with wifi to a 4K camera, the mini 4 would be a good remote display for out in the field photography that would be better than led or viewfinder on wireless expensive camera.
If you fly DJI quads, the mini 4 can be mounted and used for wireless video feed on 5ghz wifi frequency for FOV which will be more calibrated to what you see with the naked eye.