hi bernard
i don't think the bokeh on the sony 400mm looks nice, and was about to get the 70-200 until i saw the pictures on steve huffs review.
however huff recons that the examples on his review are 'beautiful' so i it's in the eye of the beholder it would seem.
however, i am not with the detractors, it is a very important aspect of the image for me, 50mm has been almost impossible to resolve until the sony 50 1.4 came along... with my nikon i used to use the hasselbald distagon 50 with an adaptor, the sony 1.4 weighs about the same, but dosen't have the build quality of the old 'blad! still, it's got to the point where these electronic cameras are like domestic appliances.
adrian