I am currently working with a 550D, and seriously debating whether to invest and buy a (semi) professional camera instead.

I focus mainly on portrait photography and for this reason purchased the 50mm/1.4f lens, which is the only thing I use since I bought it. In general I am happy with the camera and lens, but do see often photos from others that I am wondering if my current equipment is even capable of achieving... i.e., very fine details, a wider angle....

Would recommend to invest perhaps in a full frame camera? Or perhaps another lens to get the full frame effect? Or maybe I am missing something here.