It's worth noting this is largely a paper launch thus far:
https://www.reddit.com/r/intel/comments/9pidjh/any_9900k_ama...
The October 19th date that everyone was given thus far seems to be a fantasy. The new processors aren't in stock anywhere, and as of yesterday every single retailer said they were shipping today. After waiting weeks for the 19th to arrive, it's rather infuriating.