https://www.cnet.com/news/lenovo-legion-y740-y540-gaming-laptops-get-nvidias-latest/

As for their displays, the higher-end Y730 will come with a 144Hz full HD with G-Sync support allowing for smoother gaming performance with fewer artifacts, but you'll have the options for a Dolby Vision HDR 400 500-nit display. The Y540 gets a more typical 60Hz full HD display with the option for a 144Hz version with Dolby Vision HDR. 

Prices for the Y740 will start at $1,750 for the 15-inch and $1,950 for the 17-inch and will be available in February. The 15-inch Y540 arrives later in May starting at $930.  Those prices convert to approximately £1,370 and AU$2,450 and £1,530 and AU$2,730 for the Y740 and £730 and AU$1,300 for the Y540.