I put some effort into comparing quality of Gravity HD rips, might as well share it, especially since none have screenshots and few have samples.

I did all this since Gravity really needs a big screen (mine is 110") and high resolution since a lot of the joy of watching it is the pans in space with graphically fascinating images of Earth etc in the background, you really feel like you're in space - watch it on a 25" b/w set and it's mostly a rather boring movie (except for Clooneys witty remarks). And recommend surround sound.

Downloaded these, some screenshots are enclosed:

Gravity.2013.1080p.BluRay.REMUX.DTS-HD.MA.5.1-PublicHD Gravity.2013.1080p.BluRay.DTS-HD.MA.5.1.x264-PublicHD Gravity.2013.1080p.Bluray.x264.anoXmous Gravity (2013) [1080p] YIFY Gravity.2013.1080p.BluRay.x264-SPARKS Gravity.2013.720p.BRRip.x264.AAC-ViSiON Gravity 2013 1080p BRRIP x264 AAC KiNGDOM Gravity.2013.1080p.WEB-DL.x264-LTT

Audio (figures denote typ/max bitrates, data is usually from MediaInfo tool): SPARKS 6CH DTS 1509kbps, VISION 6CH AAC 445/664kbps, KINGDOM 6CH AAC 320/334kbps, Anoxmous 6CH 375kbps & 2CH 124kbps AAC, YIFY 2CH AAC 93/105kbps.

Conclusions among 1-7GB rips: KINGDOM/YIFY/VISION/SPARKS have the same video quality level (negligible differences, and the bigger files are not better), Anoxmous and LTT have noteably lower richness in details. I recommend going for VISION, which also has 6ch audio of excellent quality (to have use for higher quality audio than that you need a $100000 speaker setup and perfect hearing, trust me).

So one thing to learn from this is: If you squeeze 1080p into a very small file then the quality migh end up being lower than rips encoded as 720p. SPARKS surprises me a bit, would have expected better quality for a 6,6GB rip. Anoxmous was second from the bottom, but he usually does very good rips.

10-15GB rips: If you don't have a giant screen then don't bother with these. But there is a small but noteable difference in sharpness when going from VISION to the 10GB rip. And the 15GB rip handles noise better (noise in the video is hard for the encoders to capture at low bitrates) which gives it a small but noticeable improvement in detail. See screenshots.

Captures used while playing video in Media Player Classic Home Cinema, and saved lossless using IrfanView. Note that for most of them I have zoomed to "fit height to screen".