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Which 28/2 are we talking about here, earlier MC or later MD? I got the impression (from Phuc) that the earlier MC had a very smooth bokeh, similar to the 58/1.2, but that's not what I see here... seems hard like the final 28/2 AF design, but with more aberrations at close focus.
the earlier one with more elements, MC and MD W (the smaller one is just labeled straight MD i believe). it has very similar bokeh to the 58/1.2 - funky wide open (but the same kind of funk i like better than most) but very smooth stopped down. i would certainly not call either the 28/2 or the 58/1.2 very smooth wide open, just smoother than other f/1.2 lenses or other 28/2 lenses. both tend to be a bit smoother at long focus distances than short. the 28 seems to have slightly harder edges on the oof rings and has the disadvantage of hexagonal aperture blades (my pet peeve).
here's a wide open shot from the 28mm at a longer focal distance:
and here's a close up when the background isn't so close:
finally, here's an example from the 58/1.2 that shows somewhat similar funkiness (i can find better examples on my harddrive but don't have time to upload them):