I rented the 1.2 this winter. It's kinda soft, but the rendering is beautiful. If you're going to work at f/8, the 1.8 STM or 1.4 are both as good or better.

I rented the 1.2 this winter. It's kinda soft, but the rendering is beautiful. If you're going to work at f/8, the 1.8 STM or 1.4 are both as good or better. Wide open in heavy snowfall at night, there's nothing I've experienced like it. Not quite life-changing, but it's real good. Couldn't justify a purchase, but I may have purchased a used 1.4 a month later..... The focus-falloff, rendering, and out-of-focus elements aren't the same, but it's still wonderful in the dark and inexpensive-enough to be replaced if I kill it. Someday, the stars will align and I'll work with a 1.2 again. My desert-island lens is a (used) 400 f/5.6. Someday I'll try the 100-400, but worry about the telescoping assembly ingesting moisture and dust in the field.