35mm lenses work great on an APS-C IMO.
Hmmmm, What sort of shots do you use your 50mm lens for? Just close ups or scenes? I can't seem to make my 35mm 1.8 DX work for me, it just feels plain awkward at times. I guess I'm more a tele person or extreme wide person. But I'm still trying to make the 35mm (50mm equiv) length work for me. I find the Sigma 50mm 1.4 (80mm equiv) makes a better walkaround lens, it must just be down to opinion I guess!
I don't use the 50mm for close up scenes as much. Short to medium range mostly, but I'm never trying to get close ups with it (Unless it's the 50mm f/2.5 macro that's on my body).
Well, when I was shooting a 50mm on a crop frame I felt that sometimes it was too narrow, so I used the 35mm focal length. Now I use 50mm or 85mm on a FF camera more. However, once the 35 f/1.4L comes, I think that will change drastically. I rented a 35L for a wedding I shot and it was amazing on a full frame camera.
It's all personal opinion... But I've taken quite a liking to the 35mm FoV in my travels.