Harmy said:

Well, yeah, that's the thing though, I for one am trying to fit it on a disc, so, the bitrate and the size aren't really the variable quantity here, it's the resulting video quality, because ideally, the final mkv file will be 4.37 GB (or maybe 2.18 to fit 2 films on a DVD5 or 2.6 to fit 3 films on one DVD9 but the file size should always be fixed) and if the resolution is higher, you'll get more compression artefacts at the same file size.

But I totally see your point, it's just that I don't take x264 mkv as a way to not need discs, it's a way to have better quality on the disc of the same size.

Don't take this bad but I think most people who watch x264 mkv files stream them from their computer or media tank and store them on a big ass hard drive or even a hard drive stack.... burning mkv to disc just isn't that common...at least from what I've seen...

Try looking at the multitude of mkv releases of movies on usenet, and while they are encodes of BD the releases are not concerned about final output size as far as trying to fit to a dvd9. UNLESS you are talking about AVCHD releases. AVCHD are meant to fit to a DVD9.