I have them both, and I must say, they are not even close to each other in perspective and distortion on a FF sensor at least.
The 50 can be used for portraits and have completely different compression, much better bokeh and way more blur.
For sharpness wide open the 35 kills the 1,2. You do not buy the 50 L for sharpness over the 35 or 85. You buy it because the gorgeous 50mm focal and the compression it gives. It's seriously non dramatic lens, it gives you nothing, you have to rely on subject light and composition.
The 35 gives a cooler perspective for creative shots, VERY good AF and a lens I use A LOT for shooting my kids, not so wide and dramatic as the 24 1,4, but enough to get that connection with the subject, like they are IN your face, and the 35 is also very nice to give an extra lift to types of streetphoto.
The 50 is the bigger more mature brother that thinks and gives a more serious look, whilst the 35 is the younger brother that likes to break the rules and have fun.