I have the Canon 60D and a Canon 400D (my original camera). I have two lenses a Sigma 50mm 1.4 HSM and a Canon 28mm 1.8 USM. Both lenses are incredible performers. I've noticed the bokeh I receive on the 28mm 1.8 is incomparable to the amazing bokeh and tight DOF of the 50mm 1.4. However, being a person that likes to be close to my subjects, I see my photos are composed of 80% from the 28mm and just a few shots with the 50mm.
My question is: the 50mm seems like a great lens on a full frame camera, but the 28mm seems to fit the part for a 1.6 crop APC size sensor. Do I really need the Sigma 50mm 1.4? And consequently the extra 400D body as well? Or should I sell them for the extra cash before they lower even more in price?