Sounds like you have your mind pretty much made up, OP. But, having owned both, I'll give you my 2 cents fwiw.
They're different lenses. The 35 is built better with better AF and is slightly sharper, but if a 50 is what you need/want then you won't be entirely happy with the 35mm FL.
Probably the best thing is to try it. If you have the cash to do it without selling your 50 you can compare and see for yourself.