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 shitton 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.