I'd get the f1.8 STM it fixes the main issues people have with the 1.8 mkii ie better af, better bokeh and improved build quality. I found the f1.4 over rated wide open it is pretty soft and massively lacking in contrast and from f1.8 onwards it is no better than the new STM lens the only thing it had going for it was the faster focusing but the STM closes the gap massively.
The sigma 50mm 1.4 has a better reputation thanot the canon equivalent. I've had both and I didn't really find the sigma much better (although might not have had the best copy maybe). I've now got a sigma art 50mm f1.4 whigh is significantly better but also costs significantly more.
I'd suggest either keeping your existing lens or if you can afford it I'd get the sigma art. Personally I wouldn't bother with any of the other in between lenses
I am not a lover of the 1.4. I found it to be soft. It also has a reputation for being easily knocked out of alignment if it suffer a knock to the front end.
I've got both. You can't beat the 1.8 for price vs IQ. The 1.4 is much better built but very little IQ improvement.
The 1.8 has a 5 blade aperture whereas the 1.4 has 8 blades so there are some noticeable differences in the bokeh.
See here: http://photo.net/equipment/canon/ef50/
I upgraded from the 50mm 1.8 Mk2 to the 50mm f1.4 USM, mostly it was down to being fed up with the slow AF on the Mk2. It also helped that a friend had a 50 1.4 going spare
I did some simple tests while I had both versions. IQ wise there's practically nothing between the 1.8 and 1.4, but as said the build quality and AF are much better on the 1.4
Did you try the 1.2? I have 1.8, 1.4 and 1.2. Overall the 1.8 gets most use as so light and easy to take, 1.4 for fast AF and 1.2 when its a planned shoot and AF speed not critical.
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