Pointed images
Smooth Bokeh
Transportable
Capability to figure in low light circumstances
Compact size Down sides Build quality is rather cheap
Sharp images (not as sharp at f/1. 8, but produces excellent results at one cease higher)
Auto focus is a bit slow
Moderate color fringing and size
AF can be a bit noisy Canon EF 50mm 1. 4 USM This lens is very sturdily built compared to the 50mm f/1. 8. It is really good at its biggest opening (f/1. 4). The Auto Focus speed about this lens is fast, and not as quick as the majority of ring-USM-based lenses. The 8-blade diaphragm and maximum aperture associated with 1. 4 give this lens enable you to create shallow depth associated with field effects. Advantages Build quality is decent
Pointed image
Fast USM AF motor (but not as fast as some other Canon USM lenses)
Less prone to flare and light fall off
Excellent Bokeh and contrast Disadvantages Micro USM which is not as fast since other Canon EF USM lenses
Expensive price
Slightly soft image at full aperture
Focus ring is not smooth 50mm F1. 8 as contrasted with F1. 4
Unless you have the budget to own the 1. 4 USM, just get the 50mm 1. 8 Canon. It is an amazing lens for the price and an absolute must have lens for every professional photographer. You can get really amazing portraits, indoor and outdoor photographs with it. However, if you have the budget and are looking for a better build top quality lens, the 1. 4 USM definitely maintain a pool of edge.
First consider looking for Canon ef lens reviews and canon 50mm review before buying any other Canon digital camera.