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Sorry to be OT, newbie question, how DOF is affected as per your statement?
Basically, if you have identical framing on a DX vs. FX camera, you have to be closer to the subject on an FX camera, or have a longer focal length. Closer focus/longer focal length = shallower DOF.
The actual DOF doesn't change on FX vs. DX (DX is just a crop of FX), but to achieve the same shot you have differences in distance or focal length.
To the OP's question, I have a 50mm and a 35mm, and I don't use the 50mm a lot. I find it to be a somewhat awkward focal length - not wide enough or long enough to be super useful. I keep it because when I need f/1.4, it's the only lens I have for that purpose.