Is it worth it for me to get rid of the 1.8 for the 1.4? I have recently started doing more and more portraits. I will be getting the 85mm f/1.8 soon and was thinking it might be time to move up from the 50mm 1.8. Any thoughts? I would love to hear from someone that has had both lenses or at least had a chance to compare them. I bought the 1.8 back when I was in high school and didn't have the money for the 1.4, but now that I have the cash I'm thinking I should upgrade. Better build quality, wider aperture, slightly sharper, FTM focus.