Normally I call this kind of shot a "bokeh showcase", but it's a good shot even if you disregard the lovely bokeh. Something about the shape of the wings....
The 120 seems to draw kind of like a smoother, APO Zeiss makro, like the longer S-Planar without the edgy-ness. Too bad I missed one... :-/ I'll have to prioritize some more practical stuff right now, though - there are lots of situations where my speed-MF skills just aren't enough for the job. A Sig100-300F4 is needed to be fit into the budget for before any more MF glass is considered.