"Pro" setups often leverage High Dynamic Range (HDR), providing deeper blacks and more vibrant highlights, making the movie feel more lifelike.
The Ultimate Guide to HD Movies 5 Pro: Experiencing Extra Quality Cinema at Home
These versions are scanned from original film stock to provide the highest possible detail.
High resolution (like 1080p or 4K) is meaningless if the bitrate is low. Extra quality streams use higher bitrates to ensure that fast-moving scenes remain crisp without "blocky" artifacts.