Comparing the "look" of a lens is like trying to describe how a wine tastes LOL In my experience, the 1.4 is a cleaner, sharper image, more clinical... the 1.2 is moody and full of character, but flipside is that you deal with the (sometimes striking amount of) CA when compared to the 1.4. This is essentially the most important difference, and why some will choose the 1.2 over the 1.4: that rendering.
Obviously the 1.4 has IS, which to me is the biggest differentiator and reason to choose it over the 1.2.
1.4 has MUCH faster AF.
1.4 has a more useable closer MFD.
1.4 is a more modern lens that's really well made and solid.
I felt that the look/rendering of the 1.4 is a cross between the 85 1.2 and the 135L: sharp and corrected, but with some character mixed in. The 85 1.2 is just... *Italian chef finger kiss* classic.