Upload & Sell: On
The Zeiss 50 is just a 50, albeit a very good one, but the 45 PC-E is magic in the right hands. Doubtless you've seen the work Anton (Agentbird) has done with the lens. He really is a magician, capable of discerning within a scene exactly what should be in focus, then bathing it with the most delicious bokeh. I think the question is whether how and where you shoot would enable you to create such scenes. It isn't the 45mm focal range that matters here, but how the lens renders a scene.
Since this lens is focused manually, it is used by a number of participants in the Manual Focus Nikon Glass thread. Anton, Gregory, Ryan, Chin and LL all post images taken with this lens. Anton posts as well on the Best Nikon Shots. I'd encourage you to view their work and see if shooting that way holds appeal for you. Personally, I find it less inspiring when the subject matter doesn't allow the photographer to focus on something that is meaningful.
Here is a lovely set of images taken with this lens by Ryan in his home, Calgary Alberta.
Enjoy your adventure. As I always say, "kit building is forever..."