I'm no expert, but yes it does seem to me that there is a very large quality difference between a ~4 gb mkv 720p rip and a DVD, viewing on a 37" philips hdtv. I don't have any pictures or anything, but the higher res makes a huge difference and colors seem more vivid in an mkv. I do notice that a lot of mkv's for episodes of lost for example, which are not BR ripped, but recorded at 720p from cable broadcasts frequently have artifacts (it is aired w/ artifacts btw, I watch every week), so I doubt that is the codec/containers fault. The 8 gb mkv rips are stunning to me, example casino royale 8.5 gb rip mkv looks amazing, no artifacts, even in fast pace scanning sequences (a ****ton in this movie). In short, yes a 4 gb mkv is much better than any dvd if you ask me, probably no noticeable difference on comp monitor, but on HDTV, yes.