There are a number of differences between these two lenses. The Nikon AF-S NIKKOR 85mm f/1.4G has a Nano Crystal Coating which is an anti-reflective coating that helps reduce internal reflections across a wide range of wavelengths. It also has 9 rounded blades instead of 7 and one more internal lens element than the 85mm f/1.8G lens. This makes it super-sharp and ultra-fast for superior depth-of-field control and background blur. However, if you're looking for a light-weight lens that is meant for travel, the 85mm f/1.8G lens is a great choice! The versatile 85mm f/1.8G prime lens is ideal for capturing exceptional portraiture, wedding and concert images with fast and quiet AF. Either of these lenses would be a remarkable addition to any growing camera bag.