I'd say it competes more with illustrator but i do love my sketch. It really does feel like the fastest way to put ideas together. It's the little things, like how you're not confined to a page when you open up a new doc or the layer management that includes the object grouping. There's still a few rough spots but the philosophy is bang on. And this is before you get to the price, which frankly makes illustrator's pricetag incomprehensible.

I've had a similar experience with Acorn. I own the Adobe creative suite, but Acorn just gets out of my way. I've got enough to learn as it is.

Just like saying you know how to program after learning basic Html & CSS.

Design is not on the visual, and certainly not on the app you use.