Hello all. I have a canon 50mm f1.8 and i have considered buying the 50mm f1.4 USM for the USM feature and the 1.4 might come in handy. Then i thought about how much i loved using the 50mm on my 30d when i had that. I realized the 50mm was more like a 85mm on the 30d then when this thought popped up i considered getting the 85mm f1.8. What do you guys think? Upgrade or get something differant?