A matter of perspective
One of the key changes to version 3 is the new Perspective Efex. It’s a powerful and generally intuitive way to straighten horizons, while also fixing converging verticals, where the straight edges of buildings and other shapes lean in, barrel and pincushion distortion and volume deformation caused by using a wideangle lens (a common niggle for landscape photographers). The auto fix generally works well, or you can fine-tune the corrections manually. Somewhat buried in the interface are tools for creating fisheye effects or ‘Miniatures,’ which goes a good job of replicating the look of a tilt and shift lens. There are a lot more perspective- correction tools than you get with Lightroom, and it’s way easier to use than Photoshop, thanks to the handy before and after screen.