I found this ages ago while browsing flickr and thought it might be of interest.
A comparison of a Hasselblad with 80mm and a 5d with Contax 35/1.4 cropped to square. It's a good comparison since the 80mm behaves as a 40mm f/1.4 bokeh/depth of field-wise.
All credit to the creator of this comparison, linked below.
Pretty impressive on the part of the Contax, but the bokeh looks more natural on the hassy image and I detect a little extra thee-dimesionality (yes, 3D )