The SP line has always felt like jack of all trades, master of none. I know a lot of people are frustrated at the limitations in iOS, but I think Apple made a very deliberate decision not to put full OS X on the iPad Pro and focus it as the ultimate iPad for creatives. I think they want to push developers to develop actual tablet apps for a tablet that doesn't have to be switched into laptop mode to really get all the performance.
And as many people here have said, the new hardware looks fantastic, and it's nice to see Microsoft really trying and succeeding at having their own vision, but all of these devices still run Windows and every time I use Windows I can't wait to get back to OS X or even iOS.