Ok, I don't wanna put the lens down...
Here is a comparison with the Sigma 70mm Macro and the 77mm ltd
**You will be able to click on the image and get a full-sized version in about an hour from the time this is posted (the fullsize images are taking a LONG time to upload to my server).
Here a random shot from dinner, some bread. The OOF highlight just above the bread is a glint from my wife's wine glass.
A simple scene which I though would give fairly good bokeh.
Focused on the vase using a left of center focus point - I did not recompose.
Imported into lightroom and then exported to jpeg - 'standard screen' sharpening on the small images, no sharpening on the large.
55mm f/1.4
55mm f/1.7
77ltd f/1.8
55mm f/2.8
70mm f/2.8