This is a rendering I made of what Toronto will look like in 2020. All the projects shown are already under construction or are approved and have already reached their sales thresholds (except for Residences off 488 University Avenue which is approved but has only just started sales). They include One Bloor, Casa II, U Condos, X2 and Five Condos (which have already topped out), Wellesley on the Park, YC Condos, Massey Tower and Ten York.
Projects that I have left out because they wouldn't make a big impact from this angle (or because I was lazy) include Plaza Harbour Residences, 88 Scott, 1 Yorkville, Casa III, Yonge+Rich, Bay Adelaide East, INDX, EY Tower, Karma, Pace, the Britt and a bunch of stuff in the Entertainment District.

The original photo by
Jack Landau
Projects that might possibly be built by 2020 which would impact this angle, but which I didn't render, include 45 Bay, 156 Front, Union Centre, 50 Bloor West (aka Holt Renfrew Tower), 37 Yorkville, TeaHouse Condos and CityPlace Signature Towers.