I can prolly assume that after doing a bit of math that 1WTC has gone well past halfway to rooftop (i.e. 686.5'). It practically dwarfs everything around it *now*.
Just think. When the habitable structure's done, add the parapet and picture an intricate 438' telecom/beacon/functional spire atop all of *that*.
If this tower doesn't scream "bigger and better by a long shot" right in your ear, might I suggest--with all levity intended--wax removal treatment?
PS: Notice if you can in the first and last pics what appears to be the crane for Tower 4 peeking out right next to Gehry NY.