My i7-8700K sustains 120W+ package power under AVX loads at 4.7GHz all-core with a -50mV
undervolt, zero AVX offset. It can be considered a good sample in that respect.
If the all-core turbo for the i9-9900K is truly 4.7GHz, I'd expect 140W+, easily. As good as Intel's 14nm+++(+) process is, you're not getting 2 additional cores for free.
There is no "X" in my post. See the thread title? It has no "X" either. The 2700 is the same silicon as the 2700X and many people opted for slightly lower maximum boost clocks in exchange for better efficiency. It's still $230 after bundle discount at Microcenter, and that includes a decent stock cooler.
Source:
https://www.anandtech.com/show/12625/amd-second-generation-ryzen-7-2700x-2700-ryzen-5-2600x-2600/8
Obviously, the i9-9900K will retain the performance crown (at least, until Zen 2 in 1H2019) but it requires certain sacrifices in perf/W and perf/$. Which is the point that several people are making in this thread.