Good bokehs produced by long zooms are pretty, that's for sure. I quite like the sigma range of 35mm and the new 24mm f1.4/f1.8 which should be the best around for now, but decided to get the common Canon f1.2 instead for its weatherproofing. Nothing spectacular, not a bokeh freak but just a few test shots over the weekend.
All in f1.2 iso 100
lotus MBS f1.2 + B+W 0.8 ND to stoop down the speed in bright daylight