I've seen this issue on regular models (tiled) as well, I think, since day one. I was making a street kit some time ago and I gave up because of this issue. I thought it was my models. It was odd, it was only visible at certain angles (as mentioned). You could walk directly on top of them and look down and they appeared perfectly seamless. Get off to one side or the other, and there were the lines as shown above.
Desktop: i7 4770@3.4Ghz (passmark 9809), 12GB RAM, Win 10/64, GeForce GTX 1080 (passmark 12006), 1TB SSD, 1TB HDD; Laptop: i7 4800MQ@2.7Ghz, 16GB RAM, Win 10/64, GeForce GTX870M , 1TB SSD.