Hunter, the prime suggested by your father is very nice, but it's a bit limited for someone that's still developing a style. The high-ISO performance fo the 5D3 really eliminates any real need for a fast lens. The bokeh on all the L-series 70-200mm lenses is excellent and, yes, they all make great portrait lense. Consider the EF 70-200mm f/4L IS instead of the f/2.8, because it's much easier on the back of the neck and your arms. If you want to do a lot of concert shooting or indoor sports, then the f/2.8 does make a useful difference.