Some screenshots:
In few shots, there is no added image, hence the aspect ratio is normal letterbox; in all the others, there is a small gain top and bottom, a bit above 7% more in comparison to BD (also in very few shots, like the one in the second pic, there is a tiny bit more on one side, too - we are talking about 2 or 3 pixels…)
Has anyone done a similar comparison between the blu-ray and hdtv versions of TFA aside from the imax scene?
Force Awakens was filmed in anamorphic Panavision, thus the HDTV is pure pan and scan.
Not necessarily… an anamorphic film could gain something, too - not only on top and bottom, but sometimes also on one side: http://screenshotcomparison.com/comparison.php?id=132920