Line-height in Sketch has been a major pain point for me in since I started using it full time. It's an amazing app! I work much faster with it than any other program, but it's gotten to be incredibly frustrating how many glaring issues there are with fonts – particularly with line heights. It's easy enough to adjust a line-height until it looks the way you desired, but when you want to hand the file off to an engineer, none of the values line up to how they should build it. It's not even consistent with it's inconsistency, so you can't say 1sp in Sketch = 1.5sp in css or obj-c. And how the text sits within the container is another major problem to itself.
I've seen some people say it's an issue with the font file, but that can't be true since other apps render the font properly.
Here's an example:
The only way the folks at Bohemian Coding prioritize this issue is if we push them. So please, those of you that share this pain point with me, let's ask them!