The window size and shape were significantly different between the Caravelle and the Comet. It made them look very different types. Most people would not spot the similarity between the designs because of it. It does bring it home to you now seeing the 787 how trendsetting and leading the Comet nose design was for its time back in the 40s.
Simply as a totally pointless fact that nobody knows. Imagine a large cone standing on its base. Grab the point at the top, and move sideways with the base flat and steady so you have a leaning over cone. Then slice a horizontal section in the side. That is apparently the sort of jig they use to shape all the 747 windows. I read that in a 747 article years ago. It has improved my life immeasurably every since. It just sort of 'stuck' there.
It doesn't matter how well made the windows are, curved windows totally suck for photography out of the flightdeck. I take a lot of pictures from the flightdeck. You get the best ones from 737 windows. The 757 is dreadful as ALL the windows are curved and any decent photographs are almost impossible.