lol, you are comparing two different grade of lenses aimed at a different market.
It would be more comparable comparing 50/1.2 to 35/1.4. I guess you can't have that argument because Nikon don't currently make one. Or compare the 50/1.4 v 35/1.8 (35/2.0).
I can't speak for other people's uses but I got the 50mm because on 1.6x it was a nice portrait lens long range, on FF it's a nice all round lens, not too long and not too wide, just right and can be used outdoors and in.
Then you wanted 85mm, which you have now, which is why you love it. You never had the Sigma 35mm DX lens so you never really experienced a prime lens on crop.
I agree that they are all different focal lengths and each have a purpose, but unless you are doing something that specifically requires that focal length, then another lens might be better for you now.
That's what I am trying to say, they are different, there might only be 15mm in it but I find sometimes that 15mm is rather important.
I cant afford the 85mm and the 35mm which would be ideal for what I shoot - so the 50mm is my general purpose lens.
That works but I can't help but think that you are basically spending money on a lens that you doesn't truly want. When I went from 1.6 to FF I sold all my cropped lenses and started from scratch...save up for the lens you really want and don't go in between. It might take longer to get there but it is more economical in the long run. I basically buy the best lens for that focal length. It might take me longer to get there but the final kit will be better quality for it.
If you want an 85/35 then buy the 85/35, getting the 50 isn't what you really want so why get it? Save up a bit longer for it. Get the 1.8/2.0 versions and use that focal length (contrary to the rule above). Not buy a 50/1.4 or 1.2 because it is 1.2/1.4. You will end up learning a focal length that isn't what you desire in the first place.
I am not disagreeing a 35/85 combo is more versatile, I should know, that's the 2 lenses I put on my bodies on the job. But at the same time, they don't replace the 50mm either.
The 50mm has its place and perhaps its versatility is the best reason to keep one in your bag, not sell it to get another lens that is less versatile.
p.s. I am yearning for a 50/1.2, although for a stupid reason.