When Microsoft’s Project Scorpio releases in holiday 2017, it will “be the most powerful console ever created with 6TFLOPS capable of delivering true 4K gaming,” the company has said. In comparison, the PlayStation 4 Pro launching this holiday has 4.2TFLOPS of power and, according to Xbox planning lead Albert Penello, that “is not enough to do true 4K.”
Speaking with Eurogamer, Penello talked about how there’s a lot of asterisks around Sony’s PS4 Pro 4K marketing:

To go back to your original point about salting the competition or trying to be aggressive against them. I think there are a lot of caveats they’re giving customers right now around 4K. They’re talking about checkerboard rendering and up-scaling and things like that. There are just a lot of asterisks in their marketing around 4K, which is interesting because when we thought about what spec we wanted for Scorpio, we were very clear we wanted developers to take their Xbox One engines and render them in native, true 4K. That was why we picked the number, that’s why we have the memory bandwidth we have, that’s why we have the teraflops we have, because it’s what we heard from game developers was required to achieve native 4K. Now, similarly to what Sony said, that doesn’t mean I’m going to require developers to do this. They’re going to be able to decide to take that six teraflops of power and do what they think is best for the...