Sure, badly de-interlaced 1080i (from a video source) would look awful. But as we're talking film-based material here, and there's no difference whatsoever between 1080p/24 material output in 1080i/60 and properly deinterlaced and 1080p/24 material output in 1080p/60.
1080p is, for the time being, mostly a marketing fad. Plug a blu-ray player on a decent 1080p display, and you won't be able to see a difference when you switch the output of the player between 1080p and 1080i, because on the screen there won't be any.
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Sure, badly de-interlaced 1080i (from a video source) would look awful. But as we're talking film-based material here, and there's no difference whatsoever between 1080p/24 material output in 1080i/60 and properly deinterlaced and 1080p/24 material output in 1080p/60.
1080p is, for the time being, mostly a marketing fad. Plug a blu-ray player on a decent 1080p display, and you won't be able to see a difference when you switch the output of the player between 1080p and 1080i, because on the screen there won't be any.