24-70 II Onion Ring Bokeh

Merry Christmas Everyone.

I've been using my 24-70 II since April. Love it to pieces. Never really paid much attention to the bokeh until I took some photos of the Christmas light. Very very prominent onion ring bokeh. First I thought it might be the filter, but the same thing happened when I took off the filter.

Any thoughts? Is it inherent with this lens design or something is wrong with my specific copy?

Thanks!
 

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yup, no free lunch i'm afraid. perhaps in the pursuit of extreme sharpness and resolution, a concession had to be made with bokeh

i'm not totally crazy about the onion ring bokeh in my 70-200 2.8 II either, but i'm willing to overlook it since it's seldom a problem and i love how sharply it resolves.
 
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