From a recent Hi-Def Digest review of the new SPIDERMAN "mastered in 4K" BD:
"Considering how strong the last release was (the 2D version received a 5-star video rating from us) I really wasn't expecting to see any kind of an improvement from this disc -- especially since it's my understanding that the previous version was already mastered in 4K. Though I was a little surprised to discover that the two transfers aren't quite identical looking, for most users, the differences here will be negligible. Yes, the bitrate is technically higher (most scenes hover around the 30s as opposed to the 20s in the last release), but in motion I really could not detect any kind of discernible improvement. With that said, as the included screenshots demonstrate, there actually is an increase in apparent clarity and contrast in this transfer (though it looks like this was likely accomplished through artificial sharpening). It's much more visible in these shots than it is under normal viewing conditions, however, and once again, I want to reiterate that I could not detect any major differences between the two as I switched from source to source on my HDTV (even in fast moving scenes which usually benefit the most from increased bitrates). In fact, it was only after capturing the screenshots that I noticed any differences at all.
With the exception of the small increase in sharpness and contrast and some slight differences in framing, this transfer is virtually identical to the last already reference quality disc."
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