I used to own Canon 50mm 1.4 (got stolen), never liked the bokeh - just seemed so harsh.
Normally I don't pay much attention to such details, but this one is really bothered me, because you get kinda doubling unsharp effect. Your brain finds it annoying, because it things your eyes are not aligned properly.
I use an old Pentax 50mm 1.7 with an adapter (doesn't work on 5D ), for some reason it had pleasant bokeh. Never noticed any artifacts. Now I borrowed a Canon 50 1.4 from a friend of mine - the first thing I noticed, was this ugly bokeh
It has nothing to do with aperture blades, because this effect remains even if the 50 1.4 is wide open.
So I wonder - what's the point of a prime, if the main advantage you are getting makes your dizzy?
(Not to mention that it DOF is way to shallow on 1.4 and it can't even focus right most of the time).
Also - people say that this focal length "always looks right" - but I find it boring as hell!
I'm doing a small photo-shoot tomorrow for a girl I know - I'll be comparing it vs 24-105 and 70-200. Will post pictures.