A 1070 should do 1080p with maximum graphics settings just fine. Matter of fact it might even be over kill. I am thinking about getting a 1070 cause I may upgrade to a higher quality 1440p monitor.
1080 and 1070 are high-end graphics cards, at 1080p should be go very well with everything to the maximum in the game.
For resolutions type 1440p the 1070 in some games is a bit short, I would recommend going for the 1080 to play without falling frames at such high resolutions.
In the end everything will depend on the optimization of the game. I think it will be good.