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A few words for those who have and those who do not have the console, purely technically...
Few of those who have commented here have understood what they are talking about and this is why: a) many complain that even if they have the console "connected" to a 4k TV, they do not see any differences... why? Because the PS4 Pro is compatible with very few (currently) 4k TVs due to its support for 10-bit HDR10 TVs. This means that regardless of which TV you have, if it does not have the above, you will not see what you want. Currently, the only such TV available in the Greek market (and perhaps the best) is the Samsung KS8000. If you cannot get it, be patient or do not buy the PS4 Pro... for the sake of truth, take a link that will solve all your doubts: http://www.videogamerplus.com/2016/09/best-4k-tv-for-ps4-pro-buyers-guide.html?m=1
Others complain about the loading speed of data... well, yes! It is already faster than the regular PS4, but if that is not enough for you and you want even higher speeds, get an SSD...
Now, if you are still not satisfied, wait for the Xbox Scorpio or get a PC!
Jokes aside, the console is flawless and that counts on its own...
These are a few words from me, I hope I helped! ;)