Having shot many years with Schneider lenses on my 8x10 I was hoping for good bokeh with
Schneider LS lenses. Bokeh is nothing special wide open and stop down just one stop and it's not nice at all.
One of several reasons I dropped MFD.
That said the Mamiya 150mm 2.8 IF is really quite nice if you don't mind significant vignetting when wide open.
Pleasant vignetting actually for portraits.
IF you are looking for beautiful Bokeh the D800 with the 85mm 1.4g is the perfect combination.
Very accurate focusing with focusing points well spread out over the screen or even right in the corners in live view.
This makes it far more feasible to shoot dynamically with very shallow depth of field.
The Bokeh on the 85mm 1.4G is unmatched. It is also very smooth as you stop down thanks to the 9 blade rounded iris.
Here are a couple of images I found on flickr that shows this....
A lot more with this combo on his flickr pages:http://www.flickr.com/photos/-451/