Nope, no difference. Unlike past consoles (or Nintendo's), there is no region lock. So the only difference is warranty. Which in my 25 years of gaming, never had the chance to claim. Even if my console spoil it's always way past warranty period... 

There is one small difference. I just remembered... the X and O could be swapped. Asia regions usually have O as confirm and Western countries have X as confirm. Small adjustment but some might feel is important as well. There's only one game out of like the thousands that have come out with an issue of X/O, it's Trine 2 on the PS3. The US region has different confirm and cancel but the menus for some reason did not swap the buttons so you could not level up. But I think for PS4 all these issues are mitigated by having the controller inputs based on the game and not on system. There's another game that I was streaming that I was complaining about weird button inputs... can't remember what now. Will remember later.

Just remembered... Dishonored 1 on the PS3 didn't change the button prompt from what was shown on screen if you played the R1 game on an SEA console.

guys, what is the HDR options inside the display ps4 setting?

must have 4k tv to enable?

or full hd also can?

so usually only 4k have hdr?

full hd no?

Sharp Aquos 1080p tv.

Here's some of the latest comparisons between Pro and base PS4.

Rise of the Tomb Raider

The Last Guardian

Battlefield 1

Gravity Rush 2

Diablo III
Currently there is still no way to record footage with HDR but these 5 games don't have HDR function. Though I would recommend with all tech upgrades, don't listen to what others say. Go to a store, find a Pro and test it out yourself.

With a 4K tv, you can see a bigger difference. I bought my pro to use with my PSVR and since I can see a difference on some of the non-vr games I played, it's like a bonus to me. I have no intention of buying a 4K tv until some clown invents 8K and prices drop to 1080p tv level.

and good luck trying to find a shop to test the pro.