AReality said:f/1.2 is only about 1/2 a stop faster than the f/1.4
if u use f/1.4 at iso3200 for those really unimaginable lighting conditions, what's 1/2 more stop of post processing u going to do to the noise that will make a difference?
let's say u have to hand hold at 1/5, f/1.4, iso3200.
down the shutter speed a little more at 1/4. u get 1/3 stop more light.
The price don't justify also.
The DOF at f/1.4 is already unbearable.
But if u like f/1.2 bokehs, then it's worth the high price.
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one mans meat....
might not justify to you... but half stop, and bokeh... well worth it to me. not to mention resolution, CA, performance wide open, etc etc...