I've had my EVGA 1070 FTW for a couple of weeks now and zero coil whine (or any other noise come to that). Quietest card I've had for a while now. Last few cards were MSI (460/580/670/970).
Even on some of the loading screens where my MSI 970 gaming used to start to squeal, the 1070 is as quiet as a church mouse.
As a few others have commented, buying a graphics card is a bit of a crapshoot (IE. "a risky or uncertain matter") as they say. Pretty much applies to all the problems/issues with the current generation of graphics cards (and all previous generations come to that). Mine even has the dreaded Micron memory that's not supposed to OC very well, well on mine it OC's just fine. Luck of the draw.