AB, for example, seems to use https://github.com/metabrainz/metabrainz-logos/blob/master/final-logos/AcousticBrainz/VECTOR/SVG/AcousticBrainz_logo_mini.svg in the page header at a resolution of ~200x26 px.
On https://metabrainz.org/supporters, however, https://github.com/metabrainz/metabrainz-logos/blob/master/final-logos/AcousticBrainz/VECTOR/SVG/AcousticBrainz_logo_small.svg seems to be used at a resolution of ~158x35px and (imho) it looks way better than the plain 2-color hexagon.

The same goes for the other projects that received a new logo as well - apart from the twitter accounts and the carousel on MeB those don't seem to be used, which is a shame.