The title / post-meta styling is an improvement, I agree. As for the body test—what OS / browser / etc. is that?

Edit: I ask because, from what I've seen, Fira Sans is more readable on more platform/browser/device combinations than Concourse, as a body text font. In this case it's closer to the opposite… let me ask you this: how much of the difference between the two versions you screenshotted, for you, is made by the body text size, as distinct from the typeface per se?