I have the 50 1.2L and the 40 2.8 and I used to have the 50 1.8 I and II I love my pancake so much. It's my eveyday lens on my 5D mark II it's image quality is superp mine is very quiet focus is quick. I like the bokeh I can get with it. It keeps up when I am photographing my cat. It's amazing and so much fun to use on my full frame camera! I just leave it at 2.8 and shoot away! I've used the 50 1.4 in the store but it didn't do anything for me. I'd rather have the discreetness of the pancake.