Yeah, its not cheap but it is ridiculously good.
Since I got mine according to Lightroom I have used it for just under 70% of all of my wedding photos.
50mm can pretty much do everything, you can use it for getting ready, ceremony, portraits and the dancing. It has pretty much replaced everything that I used to use my 35/85 for.
Have been using 35/50 for quite some time now. First wedding I went 24/50 but 35/50 just seemed to suit me more. At my last wedding I only used 35/50 apart from 3 photos using the macro. Even the 35 which is also excellent only really gets used when 50 is just a little too tight.
I haven't used my 85 hardly at all over the last few months, only on a couple of occasions when I needed a longer lens for speeches.
I don't regret getting mine one bit and that is coming from someone who always struggled with 50mm focal length. When I shot Nikon I had every 50mm option including the 58mm and couldn't get on with any of them. This 50 is special.
I have taken tens of thousands of frames with mine at this point and every single time it blows me away. The rendering is superb and having the option of shooting at f/1.2 lets me get images that I have always been aiming for style wise. Some of my favourite wedding photographers have always had f/1.2 lenses and I have always been envious.