IMAX screens won't gross half of the high end multiplexes.
The point is simple, the above comparison is invalid.
It's just fans exaggerating like the way they did for Secret Superstar (Aamir), they've done bunch of the times for Srk & Salman or Hrithik & others.
TZH opening is praised not for it being just a 2D release. Also this opening was anyways expected considering the dry spell bollywood had & how the likes of Fukrey Returns benefitted.