Yeah, well, you can see some compression artifacts when you're looking for them but a lot of them are already in the source and the BD really won't be that different. I was actually thinking about lowering the bitrate of the BD encode a bit - not much, it would still be quite a bit higher than the AVCHD but enough to be able to put in more lossless audio tracks and not to have to compromise too much on the bitrate of the extras.

Currently the AVCHD is set to average bitrate of 6500 and max. of 15000 and the settings I used for the v2.0 MKV (and I was going to use for the BD) were avg.15000 and max. 40000, and considering how little difference there is between the v2.0 AVCHD and MKV, I guess going with something like 12000 average and 30000 max could make the encode smaller with very little loss of quality.