If you want to have a sea of donuts, MAKE a sea of donuts. Don't just shoot fifty frames them delete forty nine, hoping to get the one shot with the most donutty goodness.
Stop and think for a second and you might realize that, if you try, you might be able to make an angelic halo appear over somebody's head. Now, THAT would be cool bokeh! You didn't even have to use Photoshop to do it.
Maybe, someday, it might be fun to tinker but I'm not about to spend a boatload of money on a lens just for making donuts.
P.S. The guy's picture was not a sea of donuts. Just one or two annular highlights in the background. I just said that as an example.