I own a Rebel XS aka 1000D with 18-55, 50mm f/1.8 II and a recently bought Sigma 30mm 1.4 EX DC HSM. I wanted to upgrade the body to 550D but everyone whom I knew said, you don't need it, better invest in a lens.
I haven't tested my new lens fully but I'm not sure if I'll be looking at some amazing difference (or maybe I'm wrong). Do I still need to upgrade the body to get "way" better results? or playing around with the same equipment is good enough.

