Sony's new Pro is almost at RX470 performance specs and I think that's acceptable for what they are doing. HDR is a bigger upgrade than 4k resolution and their method of scaling 1440p to 4k is supposed to be really high quality making the difference between the upscaled picture and the native picture using the same base textures etc pretty tough to see. Also we have to remember that higher performance will most likely equate to higher cost. Scorpio, if it can get the numbers they claim will be a good bit more expensive. I also don't see how they can take a console with less raw performance than a GTX1070 and play games natively in 4k at good framerates unless they are targeting 30fps. What I mean by that is if you take the latest titles and play them in 4k on a GTX1070 with a fairly high end CPU, likely one that is more powerful than what will be in the console with more memory too, 4k at Very High/Ultra probably averages 40fps. So consider that maybe the GPU in Scorpio can average 30fps under the same conditions and gains 10fps due to low level access on the console with no driver overhead from the OS so it also gets 40fps average. There will be times it dips well below 30fps and that will be noticeable. I assume they will just lock to 30fps like they do currently. Wouldn't we agree that rendering below 4k and scaling it up to get us to 60fps if possible would be desireable? This is under the assumption that they won't sacrifice on the graphics quality.
Then we have to take into account the games. Remove all the games that will be on both consoles and all the games that get yearly releases and see what is left. That's where the real battle will be and for my money I'm going with Playstation on that one. The upcoming titles for the PS4 have me more excited than the Xbox exclusives. It's tough for me to even call them exclusive to Xbox because they are coming to PC which I still feel is a mistake on Microsoft's part. Take all your system sellers and put them on Windows day and date? Probably good for their business but not so good for the Xbox brand. I don't need an Xbox console and won't be subscribing to XBL Gold either. I'll be able to play Gears4, Forza Horizon 3, Recore, and Scalebound on my PC. I will not be able to play The Last Guardian, Persona 5, Horizon Zero Dawn, God of War, World of Final Fantasy, Gravity Rush 2, or Days Gone anywhere other than PS4. That's really a deciding factor for me personally. I don't expect everyone to buy these games on PC but the fact that I can really made owning an Xbox One at this time not worth it.
I guess what I'm saying here is you can check every box on a spec sheet and have the best hardware but if I am not compelled to buy the console because the games are available on my computer with even more powerful hardware available to me, it makes it a tough sell.