This is the nature of big aperture prime lenses.
With Canon 50 f1.4, you almost have to step it down to f2.8 to get sharp photos - that would kill the funs buying a f1.4 lens and shoot it at f2.8
I rather shoot with my 24-70 II @ f2.8
Mine is pretty usable at 1.4
Not softer than the 50L at 1.4
Seems like i got a pretty good one.
It does shift focus when stopping down. My 50L also did.
There was no reason to keep the expensive L (ok,
more and round blades. But u cant have everything)
I even had a 50 1.8 II which was really great wide open (sharpness. Contrast could be better)
SORRY 4 OT
I owned a 50 1.8 ii also, I liked it a lot, but the bokeh was not as smooth as the Voigtlander. Sharpness not remotely as high, either...but overall it's certainly a fine lens for the money (~$100). The smoothest bokeh via a 50mm lens is probably the 50 f/1.2L.
Call me crazy, but I bought the 40mm f/2.8 pancake with my 6D, and I like it overall better than the 50 f/1.8. It is sharper in the corners at f/2.8, has a lot less CA (basically none...the 50 1.8 had a lot of longitudinal CA...the Voigtlander also has a bit of that at wider than f/2.5 or so aperture...but very little lateral CA). The color via the 40 pancake is cooler than I like (typical of many Canon lenses though). But the contrast, sharpness...along with the ability to take in a wider field of view at 40mm than 50mm...I really like that. The 50 1.8 had a nice warm color, but was still kind of odd...emphasized magentas and purples a bit much (sort of like the colors via the 85 1.2L in my opinion...not bad, just not my preference). The Voigtlander seems more neutral, but may emphasize oranges and reds slightly, which I prefer. (The typical "Sigma color" emphasizes oranges and yellows...which can also look nice). Greens and blues look very vivid and differentiated through the Voigtlander, also. And as I've said before, the best color from a lens I've ever seen, was via the 200 f/2L. I hope Canon can someday make a sensor capable of drinking in more of that! Of course DXO will just claim whatever Nikon sensor at that time, is 10x better...haha.