League of Legends isn't that demanding, so maybe. But an 860m will definitely struggle on any other high end games at 4K, though you could run 1920x1080 instead. Should scale perfectly and not look strange.
http://shop.lenovo.com/us/en/laptops/lenovo/y-series/y50-uhd/
this one have a 4k display do you think it would be able to run league on 4k high settings
League of Legends isn't that demanding, so maybe. But an 860m will definitely struggle on any other high end games at 4K, though you could run 1920x1080 instead. Should scale perfectly and not look strange.