The 50L in my opinion is way too expensive for its performance, you don't buy a 1.2 lens to not shoot at 1.2 because it's not really sharp. Don't misunderstand me, I had it for some weeks and it got me some good shots but they all were just not comparable to the sharpness of a Sigma 35mm 1.4 or a Canon 135mm 2.0.
That and the exorbitant age of the current 50 1.4 is why everyone screams for a new 50 1.4.
Could not say it better.
5DC, 5DM3, 85 1.2L II, 80-200 2.8L, 100 2.8L IS, 14 2.8, 35 1.4, 75-300 IS, 135 1.8, 40STM, 24-85, Helios 44-2, Zeiss Lenses, and real cams like Zenza Bronica ETRSi or Fuji GX680