Neither of Marvel's 2016 films have started filming yet, for DC one is done the other recently started filming. Civil War will be out before Suicide Squad, and has a grander scale, yet it is much later to start filming.
Plus Wonder Woman starts filming this November even though it won't be out till 2017.
So far DC is putting more time into each individual film then Marvel is. Plus Disney is gonna rush the traditional SW film schedule to give us 3 (2 main series) movies in less then a year and a half.
It looks like it's Disney/Marvel that doesn't want to take their time.