Interestingly, I don’t like the bokeh from the Leica 50mm Summicron APO.
I mean, everybody raves about it. And admittedly when I examine it in photographs (magnified to reveal detail) it looks quite neutral and uniform. So it should look good overall. But when I view the image in its entirety, I intensely dislike the out of focus portions. The elements within the bokeh are too “structured”. Perhaps the out-of-focus areas — similar to the in-focus areas — are somehow “sharper”. Though neutral, the net effect is more… visible.
(Perhaps, though, people have applied too much structure during post-processing. That’s the only variable I can’t tease apart when viewing others’ images.)
My preferred 50?
Still the Leica 50 Summilux ASPH. I continue to believe that it achieves the best balance between size and performance vs. any other 50 in the full frame format. There are sharper 50mm lenses, there are more corrected 50mm lenses, and there are faster 50mm lenses, but none of them achieve the over-all balance of the Summilux.