And it’s worth it. Lightoom is worth it in general but version 5.2 is worth it specifically. Why? Because it fixes some important bugs, some small issues, as well as introducing some new functionality that you will like.
The healing tool is better: it has optional feathering now and it samples from within the cropped area.
Full details on the adobe blog. But if you have Lightroom 5, go do the free upgrade now. These issues, bugs, and features are things that have actually affected me.