Isn't this just a return to how the CPU market used to be and when it was arguably at it's best? For raw performance at any cost Intel were always on top, it used to be that for a significant decrease in cost with AMD you would see a much smaller decrease in performance, that's when Intel were at their best was when they had to ensure they had balls out performance to justify their cost, while AMD quietly plugged away making solid CPU's at a highly attractive price point.
AMD coming back into the game is good for all of us, people who want to stick with Intel will get better chips (lets face it the performance increases have been garbage for years, It took an absolute age for my 2500k to be properly battered by newer Intel chips) and people who actually want a genuinely competitive AMD chip are getting what they want with Ryzen and Threadripper.
Must admit the i7 7820 looks like a bit of a monster and only 80 odd quid more than the Ryzen 7 8 core, as I currently have a 5930k i'm not looking to upgrade for a good while yet, but I'm looking forward to what threadripper has to offer.