As a programmer with very limited design experience, I always find such analyses of fonts fascinating. The level of detail these typographers deal with is just

As a programmer with very limited design experience, I always find such analyses of fonts fascinating. The level of detail these typographers deal with is just amazing. For example, the subtle curve in the `o`s in SF versus SF compact -- I wouldn't have figured that out myself. I hope to find some time/resources to learn some of this magic myself :)