Damn.. that doesn't look right either, and I'm using the homebrew theme.Is it SF Mono by any chance?
The original font is Menlo Regular, 11 pt. At least for the ‘Basic’ theme.
El capitan. I wish I had a screenshot of by previous terminal.. is there a settings file I could fish out of my time machine perhaps?The ‘Homebrew’ theme uses Menlo at 12 pt.
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From which system have you updated?
The font rendering changed definitely. I use PragmataPro as my favorite Terminal font. With Mac OS X 10.11 the font rendering change to a slightly thinner rendering. With macOS 10.12 the rendering seems to have changed back to the way it used to be before - which I actually prefer.
Besides this, the font rendering in Preview.app did improve, too. At least on a non retina display.