I recently upgraded from a Rebel XS to Rebel T1i. I plan on sticking with this for a while, so I'd like to start my lens collection. First on my list is a nice Bokeh capable lens. After reading a few articles and knowing I want to keep my budget around $500... most people seem to agree the Sigma 1.4 50mm is the best 1.4 lens available for a Canon DSLR. I have a sensitive eye for pixelation and softness, and from what I read the Canon 1.4 can become quite soft in the 1.4-1.8 stops. I like to do a lot of shallow depth of field shot and odd shots that require me to get pretty close with the camera. I'm not saying I need to do macro close ups, but very often get very low to the ground or try to get odd perspectives that the human eye doesn't normally get to see. Based on that info other than the focal length is there any difference between these two lenses? I was going to buy the 50mm but now that I saw the 30mm and saw that it's cheaper... I'm just wondering what the benefits are besides the focal length.