The El- Nikkor 50mm 2.8f is bargain at its price.

Any comments on a comparison to the El-Nikkor 63mm?

All El-Nikkors are quality 6-element designs except the 50mm f/4 and the
75mm f/4. The El-Nikkor 63mm would be excellent for 35mm so long as you
don't need to enlarge past 11x14 on your baseboard. The longer focal length
might make it harder to make very large prints with most enlargers.