vim /Applications/Visual\ Studio\ Code.app/Contents/Resources/app/out/vs/workbench/workbench.main.css
add to .editor-container
section
-webkit-font-smoothing: antialiased;
- 2018-02-21 - 1.20.1
- 2018-02-14 - 1.20.0
- 2018-01-27 - 1.19.3
- 2017-11-30 - 1.18.1
- 2017-10-07 - 1.17.0
- 1.16.1
Just supplementing @kurdtpage instructions

However, mine was already enabled. Having VS Code and Visual Studio viewing the same file on the same monitor here, Visual Studio definitely renders the font (Source Code Pro in my case) less "blurry".