The killer feature of Zig is polish - not yet in implementation(teething issues still abound if one tries to take it into production) but definitely in design.

The killer feature of Zig is polish - not yet in implementation(teething issues still abound if one tries to take it into production) but definitely in design. It goes down the list of every language wart or make-do tooling situation in C and addresses it with a reasonably specified and generalized feature, without making the language much bigger(if it is at all - it's not a big language spec). It actively works on some really grody systems-level problems with building binaries that most languages will address with "compiles to C" and C itself addresses with "fight the build system" - Zig aims to be a one-stop shop that clarifies this process. And it integrates C code compilation into its build system, so existing projects can be migrated.