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This is good, and mostly faithful to Cantarell’s personality, but I think it’s definitely too much of a departure from the original. I remember seeing the changes between versions 0.0.24 and 0.0.25 last year and thinking, “Why is Cantarell turning into Source Sans Pro?” and this redraw takes it even further. Cantarell really grew on me (at small sizes on a low-res screen) when I was using GNOME as my everyday desktop environment, and its original personality is its raison d’être. If it’s going to become more and more like Source Sans, GNOME should just switch to Source Sans outright and save you all the work.
In particular, the sharp increase in the roundness of the curves/bowls in a, b, d, f, g, j, p, q, and 5 is too much of a difference. A few other things that seem like change for change’s sake are the altered stem-to-leg design of K/k, the slenderized quote marks, and the five-pointed asterisk.
I think the goal of the Cantarell redraw should be to make it a better version of itself—not to morph it into a whole other sans.