using non-bitmap fonts for small res games, kills quality?

[mickeyren]

maybe i'm doing something wrong but for example when i try to use this tutorial https://phaser.io/examples/v2/text/google-webfonts (google web fonts) on a low-res game (320x240) to render a 6px font size it came out blurred:

 

It's also the same when i try to do something like this:

let textStyle_Value = { font: "bold 6px sans-serif", fill: "#fff", align: "center" };

text ends up very blurry.  The only thing that is sharp for me is if i use bitmap fonts (6px):