When comparing the old Mid-Range cards (RX480/580 vs a GTX1060) then this is absolutely true, Nvidia is superior there - i had both. But when i switched from the GTX1080 to a Vega64 in another PC, it really didnt made any difference. So i guess its all about the TIER you want to compare.
As for the CPU discussion, i’m really looking forward to the new Threadripper Zen2 lineup which will come this summer/fall.