So we agree. The Nikkors and the Rodagon are fine but the Componar isn't that good.
I can't say the 50/4 is bad, it was my first enlarging lens and gave me beautiful pictures. But from a comparison I can see a difference with the 50/2.8 to be sharper to me. I haven't printed with the 50/2.8 yet, it is quite new I am sure that a difference in prints won't be visible.