The slides indicate that AMD beats its plan. If they plan 10-15% IPC, it may turn in reality more. 10% IPC is not that much for such a full die shrink.
Also, it is never great to play the catch up game with Intel - Intel hasn't even moved yet to 10nm and when it happens, guess what - the performance crown will again be theirs and people like @easyrider will buy the i9-9900K replacement.
AMD needs the absolute performance crown.
I've been overclocking for years, I've had the 9900k installed for a day...My goal is to clock it...had I bought Ryzen 2700x...I would have already been bored as its basically a maxed out chip.
Even at 4.7ghz stock its trouncing 2700x
Regardless of what you think about INTEL the 9900k is a great chip
Looking forward to trouncing Ryzen 3000 with a 6 month old chip when its released