The key is that when you say 1080i60 that is referring to 60 fields/second, not 60 frames/second. 1080p60 is 60 frames/second. 1080p has the unnatural "judder" because film is 24fps. And, 1080i60 can be deinterlaced to 1080p60 through a TVs inverse telecine circuit; all the data of a 1080p...