As long as I’ve used Sketch, I’ve wanted a way to display the letters in hex color codes in lowercase, which I find easier to read. See the two contrived but possible examples below. The top inspector screenshot is Sketch, the bottom with a few typography adjustments.
The adjusted hex codes are rendered in Apple SF Pro Text with the “High legibility” (note the open 4 and slashed zero) and “One storey a” settings enabled in the Typography panel accessed in Sketch from View > Show Fonts > gear menu > Typography. I also applied character spacing of 0.2 to give the glyphs a little more breathing room.
On a related note, it would be great if Sketch’s text styles accounted for settings enabled in the Typography panel. As of the 53 beta release (71998), things like the “Single storey a” are not saved to and applied by Sketch text styles.